Intertrigo is a type of dermatitis or skin inflammation caused by the repeated friction of skin rubbing against skin. It can appear anywhere two skin surfaces lie next to each other and rub together, but most often occurs in the skin folds of the groin and underarms, and between the ribs and the breasts. This condition is most common in warm climates and during the summer.

Intertrigo appears as a reddish rash that may be sore or itchy. It usually progresses gradually; beginning as a mind chafing, then slowly, with continued exposure to moisture and friction, develops into a persistent itchy rash. Occasionally, a secondary infection (bacterial or fungal) may develop, causing the formation of pustules and weeping and oozing of the skin, as well as severe itching and pain.

Severe intertrigo primarily affects overweight woman who perspire heavily. People with diabetes also are more disposed than others to developing intertrigo and accompanying secondary infection. Persons who suffer urinary incontinence are at increased risk of developing intertrigo in the groin area.