Intertrigo is a skin condition that causes a rash in folds of the skin, such as under the breasts, in the groin, or under the tummy fold. It happens when areas of moist skin rub together. Bacteria and yeast can grow in this environment, leading to an infection. In this article, we describe what intertrigo is, what it looks like, and what causes it. We also cover diagnosis, treatment, and prevention. Intertrigo is a skin condition that happens when folds of skin chafe against each other. It usually develops in the inner thighs or armpits, or under the breasts or tummy fold. Some people may experience yeast or bacterial infections in the folds of skin. Areas of moist skin rubbing together cause intertrigo. The warm, damp environment makes the skin conducive to irritation and the growth of yeast and bacteria, which can lead to an infection. While it can happen at any age, intertrigo tends to affect infants, older people, and those with a reduced ability to move around. In babies, it is of...