Humans ; East Asian People ; Surveys and Questionnaires ; Vitiligo/epidemiology*

Vitiligo is a depigmentation disease affected by a variety offactors,of which genetic factors play a key role.Single nucleotide polymorphism as a common type of genetic variation can be detected by candidate gene analysis and genome-wide association study.The recent studies have demonstrated that multiple susceptibility genes play a vital role in the occurrence and development of vitiligo.This article introduces the single nucleotide polymorphisms of vitiligo susceptibility genes according to the gene functions.
Humans ; Polymorphism, Single Nucleotide ; Vitiligo/epidemiology* ; Genome-Wide Association Study ; Genetic Predisposition to Disease ; Case-Control Studies

OBJECTIVEGenetic factors are thought to be involved in the development of vitiligo. The aim of this study is to explore the possible genetic model of vitiligo by analyzing the genetic characteristics of 815 patients from Zhejiang province.

METHODSData for 815 patients with vitiligo together with their first- and second-degree relatives were obtained using a standardized questionnaire. All these information was requested to confirm the answers about family history in order to reduce the possibility of 'recall' bias. The 815 probands would include 411 (50.43%) males and 404 (49.57%) females with a varied age from 2 months to 71 years old. Since the information on general prevalence of vitiligo in this area was absent, a control group was set up to facilitate the calculations of heritability degree. 468 persons of the control group were from non-vitiligo population with a sex ratio of 241(male): 227(female) with varied age of 4 months to 80 years old. Both gender and age were comparable between the vitiligo and the control population. The inheritance pattern estimation, heritability calculation and complex segregation analysis were performed with Penrose method, Falconer regression method and SAGE-REGTL program.

RESULTSIn 815 vitiligo probands, 128 had and 687 had not family histories, with a heritability rate of 15.7%. The vitiligo prevalence in proband's first degree relatives was 2.580%, higher than the prevalence of 0.618% in second degree relatives, and both of them were higher than general prevalence: 0.192%. By Penrose method, the rates on different catagories were as follows: sibling prevalence rates s = 0.080 18; population prevalence rate q = 0.001 92; s/q = 41.76. The ratio of s/q did not approach 1/2q (260.42) or 1/4q (130.21), but approached 1/square root of q(22.82), suggesting vitiligo was consistent with a mode of polygenic inheritance. Using Falconer's method, heritabilities of vitiligo in first-and second degree relatives of probands were 59.61% (95% confidence interval 65.37-53.84) and 55.20% (95% confidence interval 43.88-66.52), respectively. The weighted average of heritability in all relatives was 58.7% (95% confidence interval 53.56-63.83). The results of complex segregation analysis suggested that major gene model including the Mendelian dominant, recessive and additive hypotheses were not rejected (P > 0.05). Purely environmental model and no transmission model were rejected at a 0. 001 significance level. According to AIC, Mendelian dominant inheritance was the best-fitted hypothesis.

CONCLUSIONGenetic factors played an important role in the occurrence of vitiligo, and the genetic model of vitiligo could serve as the polygenetic or multifactorial inheritance with major gene trait.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Child ; Child, Preschool ; China ; epidemiology ; Female ; Humans ; Infant ; Male ; Middle Aged ; Models, Genetic ; Vitiligo ; epidemiology ; genetics ; Young Adult

PURPOSE: Vitiligo prevalence and its associated comorbidities rate have been reported variably among different populations. We aimed to determine the prevalence of vitiligo in Korea along with the baseline rate of comorbidities and compared the risks to the general population using hospital visit information of the total population in Korea. MATERIALS AND METHODS: We assessed demographic characteristics of vitiligo patients in Korean population from 2009 to 2011 in a nationwide data from Health Insurance Review Assessment Service. Patients who had at least one visit to Korea's primary, secondary, or tertiary referral hospitals with International Classification of Diseases, 10th Revision, Clinical Modification diagnosis code for vitiligo were identified. As a supplementary study, comorbidities associated with vitiligo were selected for further review to calculate relative risks compared to the general population. RESULTS: The annual prevalence of vitiligo determined by hospital-visiting rate in Korea was 0.12% to 0.13% over a three year period. In sync with other previous epidemiological studies, there was bimodal distribution among the age groups and no difference between genders. Also, vitiligo in Korean population was associated with various autoimmune/non-autoimmune diseases such as thyroiditis, atopic dermatitis, and psoriasis. CONCLUSION: This study was by far the most comprehensive review on prevalence of vitiligo using a data of total population in Korea. The prevalence is within a range of those reported in previous literatures, and increased risk of comorbidities such as thyroid diseases and psoriasis in vitiligo might aid clinicians in the initial work up of vitiligo patients and concurrent follow ups.
Adult ; Aged ; Autoimmune Diseases/*epidemiology/immunology ; Comorbidity ; Diabetes Mellitus, Type 1/epidemiology ; Female ; Humans ; Male ; Middle Aged ; Population Surveillance ; Prevalence ; Republic of Korea/epidemiology ; Socioeconomic Factors ; Thyroid Diseases/epidemiology ; Vitiligo/*epidemiology

BACKGROUND: The epidemiology of pediatric dermatoses shows a tendency to change as social development and the environment improve. OBJECTIVE: The purpose of this study was to investigate the distribution of pediatric dermatoses in Gwangju, Jeonnam province, and to compare the results with previous reports from the same area (1990~1994). METHODS: New patients under 15 years of age, who visited the Department of Dermatology, Chonnam University Hospital from 2000 to 2004, were reviewed through the clinical records. The results were compared with the previous reports from the same area (1990~1994). RESULTS: Of 25,428 new patients, 4,156 (16.3%) were pediatric patients. There was a male to female ratio of 1.12:1. The ten most common dermatoses were atopic dermatitis (13.0%), verruca (12.2%), vitiligo (7.2%), urticaria (6.2%), epidermal nevus (3.7%), fungal infection (3.5%), eczematoid dermatitis (3.5%), alopecia (2.9%), melanocytic nevus (2.6%) and contact dermatitis (2.6%). In the annual distribution, dermatoses showing an increasing tendency were identified as verruca, alopecia, epidermal nevus and melanocytic nevus. CONCLUSION: The proportion of pediatric dermatoses with viral diseases and cosmetic problems such as alopecia and pigmented nevi appeared to be higher in comparison to the previous report. This might be largely due to the increase of cosmetic interest with accompanying emotional stress at school.
Alopecia ; Dermatitis ; Dermatitis, Atopic ; Dermatitis, Contact ; Dermatology ; Epidemiologic Studies* ; Epidemiology ; Female ; Gwangju* ; Humans ; Jeollanam-do* ; Male ; Nevus ; Nevus, Pigmented ; Skin Diseases* ; Social Change ; Stress, Psychological ; Urticaria ; Virus Diseases ; Vitiligo ; Warts

BACKGROUND: There has been no statistical study of dermatoses in the Suwon area and southern area of Kyonggi province which has been rapidly developing in the last 7 years. OBJECTIVE AND METHODS: We evaluated the recent distributions of dermatoses in the Suwon area and southern area of Kyonggi and compared them with the previous reports of other provinces of Korea. Fifty two thousand, one hundred fifty three new outpatients who visited the Ajou University Hospital from 1995 to 2001 were analysed statistically. RESULTS: The study results are summarized as follows: Among the 52, 153 outpatients, the total number of male patients were 24, 005(46.0%) and female patients were 28, 148(54.0%). The frequency of age groups are as follows; the age groups were the 3rd decade(22.0%), 4th decade(20.4%), 1st decade(18.7%), 5th decade(11.5%), 2nd decade(11.1%), 6th(8.5%), 7th(5.4%), 8th and above(2.4%). The distributions of dermatoses as disease groups were eczema(28.6%), dermatophytosis(8.7%), erythema urticaria and drug eruption(8.1%), disease of skin appendages(7.9%), viral infection(7.3%), etc. Those dermatoses which demonstrated a tendency to increase annually were seborrheic dermatitis, hyperpigmentary disorders, verruca, and alopecia areata. The incidence of dermatophytosis, in particular, decreased during the study period. Seasonal distribution showed that those diseases occurring the most frequently during the summer were dermatophytosis, allergic contact dermatitis, urticaria, verruca, and vitiligo. The incidence of atopic dermatitis and nevocellular nevi increased during the winter season. Acne vulgaris was the disease occurring frequently during summer and winter. Sexual distribution of dermatoses showed that hyperpigmentary disorder, nevocellular nevi, benign epidermal tumor, acne, allergic contact dermatitis, and irritant contact dermatitis were more frequent in females, and dermatophytosis, seborrheic dermatitis, alopecia were more frequent in males. Age distribution was as follows; atopic dermatitis, vitiligo and verruca was the most frequent in the 1st decade. Acne vulgaria was the most frequent in the 2nd decade and 3rd decade. Hyperpigmentary disorder and seborrheic dermatitis were the most frequent in the 4th decade. Hyperpigmentary disorder was the most frequent in the 5th decade and herpes zoster in 6th, 7th and 8th decade and above. CONCLUSION: In contrast to an earlier published report from Seoul, the infectious dermatoses, especially parasitic infestation, showed a tendency to decrease and nevocellular nevi, hyperpigmentary disorder and alopecia showed a tendency to increase. The distribution pattern of the skin disease did not differ from other provinces of Korea in general.
Acne Vulgaris ; Age Distribution ; Alopecia ; Alopecia Areata ; Dermatitis, Allergic Contact ; Dermatitis, Atopic ; Dermatitis, Contact ; Dermatitis, Seborrheic ; Epidemiology ; Erythema ; Female ; Gyeonggi-do* ; Herpes Zoster ; Humans ; Incidence ; Korea ; Male ; Nevus ; Outpatients ; Seasons ; Seoul ; Skin ; Skin Diseases* ; Statistics as Topic* ; Tinea ; Urticaria ; Vitiligo ; Warts

BACKGROUND: Pediatric dermatoses can be regarded as a different disease because a child's skin differs from an adult's skin in many aspects. OBJECTIVE: The purpose of this study was to evaluate the distribution of pediatric dermatoses in the Kyonggi-do Ansan area and to compare the results with previous reports. METHODS: New patients under 15 years of age who visited Korea University Ansan hospital from 1998 to 2002 were reviewed using their clinical records. RESULTS: The study results are summarized as follows; Among the 25, 839 new patients, 7, 255 (28.1%) were pediatric patients with a male to female ratio of 1: 1.12. In the age distribution, the number of patients decreased with increasing age. The Peak incidence occurred in August, July and January in decreasing order. The incidence was more prominent in summer and winter. The ten most common dermatoses were atopic dermatitis, viral wart, contact dermatitis, urticaria, molluscum contagiosum, dermatophytosis, vitiligo, hemangioma, nevocellular nevus, and acne in decreasing order. In the annual distribution, dermatoses showing an increasing tendency were identified as atopic dermatitis, viral wart and acne, whereas dermatophytosis showed a decreasing tendency. CONCLUSION: Compared to previously published reports, the distribution of dermatoses was different and the proportion of pediatric patients had decreased according to the reduction of the pediatric population.
Acne Vulgaris ; Age Distribution ; Dermatitis, Atopic ; Dermatitis, Contact ; Epidemiologic Studies* ; Epidemiology ; Female ; Gyeonggi-do* ; Hemangioma ; Humans ; Incidence ; Korea ; Male ; Molluscum Contagiosum ; Nevus ; Skin ; Skin Diseases* ; Tinea ; Urticaria ; Vitiligo ; Warts

BACKGROUND: The incidence of skin diseases in the university hospital may not truely indicate their province in the population, nevertheless it offers the only available source of information.Objective and Method: To study the prevalence of common dermatoses and compare this with previous reports, we reviewed 20, 000 new outpatients who visited the Department of Dermatology at Wonju Christian Hospital from 2000 to 2004, and have statistically analyzed the findings. RESULTS: The study results are summarized as follows: 1. Of the 20, 000 outpatients, the total number of male patients was 9, 871 (49.4%), and the numbers of female patients was 10, 129 (50.6%). 2. As for age distribution, the most frequent age group was the first decade (15.3%), fifth decade (15.1%), fourth decade (13.9%) and sixth decade (13.7%), comprising 58% of the total outpatients. 3. The 19 most common dermatoses were found to be dermatophytosis, atopic dermatitis, allergic contact dermatitis, other eczema, urticaria, alopecia, herpes zoster, seborrheic dermatitis, psoriasis, bacterial infection, pruritus, drug eruption, vitiligo, acne, verruca, irritant contact dermatitis, benign epidermal tumors, nevocellular nevus and hyperpigmentary disorders. 4. Those dermatoses which showed a decreasing tendency to be treated by medicine included allergic contact dermatitis, other eczema, bacterial infections, acne, and irritant contact dermatitis. An increasing tendency was noted in dermatophytosis, urticaria, alopecia, herpes zoster, seborrheic dermatitis, psoriasis, pruritus, drug eruption, vitiligo, verruca, benign epidermal tumors and nevocellular nevus. There was no significant annual difference in incidences of hyperpigmentory disorders compared to atopic dermatitis. 5. Diseases with high seasonal distribution in summer were dermatophytosis and verruca. However, atopic dermatitis, alopecia, herpes zoster and pruritus showed high incidence in the winter period. Acne showed a peak incidence in both summer and winter. 6. As for gender distribution, dermatophytosis, alopecia, seborrheic dermatitis, bacterial infection and vitiligo showed a high frequency in males, whereas allergic contact dermatitis, urticaria, herpes zoster, psoriasis, pruritus, drug eruption, acne, epidermal benign tumors, nevocellular nevus and hyperpigmentary disorders showed a high freguency in female. 7. In age distribution, atopic dermatitis, bacterial infection, vitiligo, verruca and nevocellular nevus were found to be the most frequent in the first decade, and acne and alopecia in the second decade. Urticaria and psoriasis were most frequent in the third decade; dermatophytoses, allergic contact dermatitis, irritant contact dermatitis and hyperpigmentary disorders in the fifth decade; other eczema, seborrheic dermatitis and pruritus in the sixth decade; herpes zoster and drug eruption in the seventh decade; and epidermal benign tumors in the eighth decade. 8. In the distribution of dermatoses as disease groups, eczema (25.5%), diseases of the skin appendages (10.8%), dermatophytosis (10.0%), erythema, urticaria and drug eruption(10.2%), viral infections (8.4%), papulosquamous disease (4.1%), and pruritus and neurocutaneous disease (3.9%) constituted 72.5% of the total. CONCLUSION: The distribution of skin disease in our hospital was similar to studies wnducted in other provinces. Comparing the alone results with earlier studies carried out in the same area by Lee (3), Won (2) and Song (1), there was a relatively low incidence of dermatoses caused by animal parasites. However, a predominently high incidence of age related dermatoses was found.
Acne Vulgaris ; Age Distribution ; Alopecia ; Animals ; Bacterial Infections ; Dermatitis, Allergic Contact ; Dermatitis, Atopic ; Dermatitis, Contact ; Dermatitis, Seborrheic ; Dermatology ; Drug Eruptions ; Eczema ; Epidemiology ; Erythema ; Female ; Gangwon-do ; Herpes Zoster ; Humans ; Incidence ; Male ; Music ; Nevus ; Outpatients ; Parasites ; Prevalence ; Pruritus ; Psoriasis ; Seasons ; Skin ; Skin Diseases* ; Statistics as Topic* ; Tinea ; Urticaria ; Vitiligo ; Warts

BACKGROUND: Occurrence of dermatoses are influenced by various environmental factors in the area people live. Jeonbuk province, as well as other parts of Korea, has developed industrially for the past three decades. Until now, no statistical survey on dermatoses in Jeonbuk province has been made. OBJECTIVE: To compare the prevalence and trend of dermatoses by patients' age and time in Jeonbuk province over last 30 years. METHODS: The survey was conducted via the medical records of 55, 335 patients seen in Chonbuk National University Hospital from 1979 to 2002. RESULTS: The study results are summarized as follows: 1. Among the 55, 335 new patients (male 47.2%, female 52.8%), the 15 most common dermatoses were as follows (in order of frequency): dermatophytosis (7.8%), urticaria (7.7%), acne (5.2%), atopic dermatitis (4.9%), alopecia (4.4%), seborrheic dermatitis (4.3%), herpes zoster (4.0%), other eczema (3.9%), vitiligo (3.8%), psoriasis (2.6%), pruritus (2.5%), benign epidermal tumor (2.4%), verruca (2.2%), allergic contact dermatitis (1.7%), and irritant contact dermatitis (1.5%). These comprise 58.9% of the total outpatients. 2. The incidences of atopic dermatitis, alopecia, vitiligo and benign epidermal tumor had increase d (about 5 times), while dermatophytosis and urticaria had decreased (about 0.64 times) during the period. 3. The most frequent dermatoses during the summer season were dermatophytosis and vitiligo. In winter season, they were acne, atopic dermatitis, seborrheic dermatitis, psoriasis, pruritus, benign epidermal tumor and verruca. 4. The occurrence of scabies decreased rapidly from the early 90's and remained at a decreased level. Leprosy and tuberculosis had often occurred during the 80's and then became rare from the 90's. 5. The distribution of patients' age was as follows: The 3rd decade (22.0%), 2nd decade (15.8%), 1st decade (15.5%), 4th decade (14.7%), 5th decade (12.0%), 6th decade (10.3%), 7th decade (2.6%), 8th and above (0.4%). 6. Atopic dermatitis was found to be the most frequent dermatosis in the 1st decade. Vitiligo, benign epidermal tumor, and verruca were the most frequent in the 2nd decade, and urticaria, acne, alopecia, seborrheic dermatitis, psoriasis, allergic contact dermatitis and irritant contact dermatitis in the 3rd decade. Herpes zoster and pruritus were the most frequent in the 6th and 7th decade. CONCLUSION: From medical records between 1979 and 2002, we surveyed kinds, prevalence rates and trends of dermatoses in the Jeonbuk Province. During this period we observed changes in the incidence of the dermatoses with years and seasons. We also found that prevalence rates of the dermatoses were influenced by the time, environment and living conditions of the patients. To the best of our knowledge, this is the first survey on the occurrence of dermatoses Jeonbuk Province of Korea.
Acne Vulgaris ; Alopecia ; Dermatitis, Allergic Contact ; Dermatitis, Atopic ; Dermatitis, Contact ; Dermatitis, Seborrheic ; Eczema ; Epidemiology ; Female ; Herpes Zoster ; Humans ; Incidence ; Jeollabuk-do* ; Korea ; Leprosy ; Medical Records ; Outpatients ; Prevalence ; Pruritus ; Psoriasis ; Scabies ; Seasons ; Skin Diseases* ; Social Conditions ; Statistics as Topic* ; Tinea ; Tuberculosis ; Urticaria ; Vitiligo ; Warts