photo-Köbner現象を認めた小児の乾癬

・小児期に発症した膿疱性乾癬患者．経過中，海水浴による日焼けを契機に乾癬が悪化した．

・過去には光線療法で治療効果が得られていた．

（「症例のポイント」より）

　

Pediatric psoriasis showing photo-Köbner phenomenon

　

Hiraiwa, Tomoko1）Yamamoto, Toshiyuki1） 1）Department of Dermatology, Fukushima Medical University

　

A female patient was diagnosed with generalized pustular psoriasis at the age of 4 and was relatively well controlled with topical and PUVA treatments. During the course, the rash was exacerbated after sunburn in the sea at the age of 11 years old, and she was admitted to our hospital. Although ultraviolet (UV)light therapy is an essential treatment for psoriasis, there are rare cases in which psoriasis get worsened by UV light exposure (photosensitivity psoriasis：PP). The mechanism that UV light makes psoriasis better or worse is still unclear but, in our case, it was speculated that UV caused exacerbating psoriasis via activation of innate immunity.