PUVA-induced lichen planus.
A 28-year-old male with histologically proven psoriasis vulgaris was administered oral 8-methoxypsoralen UVA therapy (PUVA). The plaques of psoriasis gradually responded to treatment, however numerous pruritic, violaceous papules over the right forearm and left thigh developed 5 months after starting PUVA (45 sittings with a cumulative dose of 156 J/cm(2)). Histopathologic examination of these lesions was compatible with the diagnosis of lichen planus (LP). On stopping PUVA therapy, the lesions subsided in one month. This case emphasizes the hypothesis that cell injury caused by PUVA therapy could expose some sequestered antigens to autoreactive lymphocytes and induce lichen planus.
Nanda
Soni
S
Department of Dermatology, Venereology and Leprology, Maulana Azad Medical College and Associated Hospitals, New Delhi, India.
Grover
Chander
C
Reddy
Belum Siva Nagi
BS
D000328:Adult; D006801:Humans; D008010:Lichen Planus / Q000209:etiology* / Q000473:pathology; D008297:Male; D011701:PUVA Therapy / Q000009:adverse effects*; D011565:Psoriasis / Q000188:drug therapy*