Four Cases of Unusual Pigmentation after UVB Phototherapy for Psoriasis.
- Author:
Yoon Kee PARK
;
Hyung Joo KIM
- Publication Type:Case Report
- Keywords:
Unusual pigmentation;
UVB;
Psoriasis
- MeSH:
Humans;
Hyperpigmentation;
Lentigo;
Lower Extremity;
Melanins;
Phototherapy*;
Pigmentation*;
Psoriasis*;
PUVA Therapy
- From:Korean Journal of Dermatology
1986;24(3):386-390
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The ability of photochemotherapy(PUVA) or UVA phototherapy to stimulate melangenesis is well known. It is now recognized that the PUVA lentigines, irregular in outline and often more darkly and unevenly pigmented than solar lentigines, are related to the additional pigmentary effects of the PUVA therapy. We present herein four cases of unusual pigmentation after one month of UVB irradiation. Raticulated dark brown pigmentation appeared on the lower extremities of the patients. Histopathologicially, an increase in melanin in the basal layer was found, but no dysplasia or malignant change. We suggest UVB as the cause of this unusual hyperpigmentation.
