A peristomal plaque of sudden occurrence

Abstract

Abstract Koebner phenomenon regards the formation of a psoriatic lesion after a trauma, including tattoo, insect bite or other injuries. Although this manifestation is not specific for psoriasis, physicians should be aware because early recognition may be helpful in making the diagnosis when present.

Keywords

• colostomy bag
• Koebner phenomenon
• peristomal skin
• psoriasis