Dermatological signs during inflammatory bowel diseases.

Crohn disease (CD) and UI-cerative Colitis (UC) are characterized by ulcerative lesions of the bowel. Some patients show similar lesions of the skin or oral and/or perianal mucosa. Sometimes these lesions, or some other skin lesions are the first sign of bowel disease. Dermatologists could suspect an inflammatory bowel disease (IBD) during skin lesions such as pyoderma gangrenosum (PG) or erythema nodosum (EN). These entities are very well known by dermatologists and its role is to diagnose internal chronic disease associated to EN or PG. Depending on the associated disease the treatment may vary from steroids to anti TNF biologics.