Korean J Dermatol.  1986 Jun;24(3):386-390.

Four Cases of Unusual Pigmentation after UVB Phototherapy for Psoriasis

• Park YK
• Kim HJ

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.

Keyword

Unusual pigmentation; UVB; Psoriasis

MeSH Terms

Humans
Hyperpigmentation
Lentigo
Lower Extremity
Melanins
Phototherapy*
Pigmentation*
Psoriasis*
PUVA Therapy
Melanins