WebMD explains the causes, symptoms, and treatment of intertrigo -- a common rash that appears in folds of skin . What is intertrigo Intertrigo describes an inflammatory skin rash in the body folds, such as behind the ears, in the folds of the neck, under the arms (armpits), under a protruding abdomen, under the breasts, in the groin, between the buttocks, in the finger webs or toe spaces. Intertrigo is caused by irritation of touching skin surfaces (skin-on-skin friction) in body fold regions (armpits, under the breasts, belly, buttocks, groin, and sometimes between fingers or toes). Intertrigo ’s ... Intertrigo (intertriginous dermatitis) is an inflammatory condition of skin folds, induced or aggravated by heat, moisture, maceration, friction, and lack of air circulation. Intertrigo frequently is worsened or colonized by infection, which most commonly is candidal but also may be bacterial or viral or due to other fungal infection. Intertrigo is a rash that occurs in skin folds, where skin rubs against skin. Learn about the symptoms, causes, treatments, and prevention tips for this common condition.