BACKGROUND: Laser therapy for various skin conditions is one of the most common procedures in dermatology. Recently, several articles described the use of 1064 nm Q-switched Nd:YAG lasers for the treatment of benign skin lesions. Such treatment is known to trigger its therapeutic effect through a photoacoustic effect and selective photothermolysis effect. However, only a limited number of articles have dealt with the theoretical base of the photoacoustic effect of the 1064 nm Q-switched Nd:YAG laser. OBJECTIVE: To compare the wound repair process and nonselective tissue heat damage induced by three different laser modalities: the CO2 laser, Er:YAG laser, and 1064 nm Q-switched Nd:YAG laser. METHODS: We irradiated the skin of an albino rat (Sprague Dawley(R), 200~250 g) with CO2, Er:YAG, and 1064 nm Q-switched Nd:YAG lasers. Skin biopsy specimens of the irradiated areas were collected on the first, fifth, and tenth day after laser exposure. For histologic analysis, the specimens were stained with the H&E, Verhoff-Van Gieson, and Masson's trichrome protocols. RESULTS: Compared with other laser modalities, rat skin irradiated by the 1064 nm Q-switched Nd:YAG laser showed the least amount of heat damage and the quickest tissue repair response to the damage. CONCLUSION: A 1064 nm Q-switched Nd:YAG laser with a photoacoustic effect capable of ablating the epidermis and dermis can be a proper treatment modality for the removal of benign skin lesions. The 1064 nm Q-switched Nd:YAG laser may be considered as an alternative treatment option for the treatment of benign skin lesions.
Animals ; Biopsy ; Dermatology ; Dermis ; Epidermis ; Hot Temperature ; Laser Therapy ; Lasers, Gas ; Rats* ; Skin* ; Wounds and Injuries*

Recent studies recommend pegylated interferon alpha2a as the first choice treatment for chronic hepatitis B, especially when the patient is negative for HBeAg. Pegylated interferon alpha is known to show variable side effects including skin symptoms, with alopecia as the most common dermatologic side effect experienced for 10% up to 36%. pcc) Most alopecia cases related to pegylated interferon alpha were presented with telogen effluvium pattern, but alopecia areata cases are reported rarely. In this case, typically localized alopecia areata was presented with pegylated interferon alpha2a treatment in hepatitis B patient, and the course of alopecia areata seemed to be related with administration and discontinuation of pegylated interferon alpha2a.
Alopecia Areata* ; Alopecia* ; Hepatitis B ; Hepatitis B e Antigens ; Hepatitis B, Chronic* ; Hepatitis, Chronic* ; Humans ; Interferon-alpha ; Interferons* ; Skin

Vitiligo universalis is an uncommon variant that is rarely seen. Interestingly, vitiligo universalis often accompanies systemic diseases such as endocrinopathies. A 43-year-old man presented with whole body depigmentation and poliosis affecting most of his scalp and body hair. He had undergone a liver transplant 2 years ago due to liver cirrhosis from a chronic hepatitis B infection and has been treated for diabetes mellitus for several years. Histopathology showed no melanocytes and an absence of epidermal pigmentation on the skin. We herein report a rare case of vitiligo universalis associated with chronic viral hepatitis B.
Adult ; Diabetes Mellitus ; Hair ; Hepatitis B ; Hepatitis B, Chronic ; Hepatitis, Chronic ; Humans ; Liver ; Liver Cirrhosis ; Melanocytes ; Pigmentation ; Scalp ; Skin ; Transplants ; Vitiligo