A Case of Photosensitive Psoriasis Initiated by Sun Exposure

Photosensitive psoriasis is defined as psoriasis in which the lesions deteriorate or new lesions appear after sun exposure. Photosensitive psoriasis is infrequent and the prevalence among psoriasis patients is estimated to be 5.5%. Furthermore, the first expression of psoriasis induced by sun exposure is known to be a very rare event. We report a case of photosensitive psoriasis on the sun-exposed area in a 24-year-old healthy male patient who had had no history of psoriasis or other photosensitive skin diseases earlier.