炎症性腸疾患，Behçet病の皮膚病変

Skin Manifestations in Inflammatory Bowel Disease and Behçet's Disease

要旨●潰瘍性大腸炎とCrohn病に代表される炎症性腸疾患（IBD）はさまざまな腸管外合併症を伴うことが多く，なかでも壊疽性膿皮症や結節性紅斑などの特徴的な皮膚病変を伴う．またBehçet病でも診断において重要な皮膚病変を伴う．これらの皮膚病変からIBDやBehçet病の診断に至ることもある一方，消化器病変の病勢に並行しない皮膚病変もあり，皮膚症状の把握については，消化器科診療において注意深い観察が必要である．皮膚病変の治療にあたりステロイド内服などの全身療法が必要になる場合もあるので，皮膚科医との連携が重要である．

　We presented skin manifestations in IBD（inflammatory bowel disease）and Behçet's disease. Entraintetsinal complications are frequent in ulcerative colitis and Crohn's disease, and pyoderma gangrenosum and erythema nodosum are included in the specific skin manifestation in IBD. In Behçet's disease, skin and mucosal lesions are important for diagnosis and are included in the diagnostic criteria. Skin manifestation in IBD or Behçet's disease usually corresponds to the activity of intestinal lesions; therefore, careful follow-up for skin lesions is important in clinical practices. Systemic corticosteroid administration is occasionally required for treating of skin lesions. Therefore, collaboration with dermatologists is recommended.