A skin tag is a hanging growth of skin tissue. Skin tags are usually not cancerous and do not typically cause pain. However, irritation can occur if the skin tag frequently rubs against clothing or jewelry. A skin tag may appear anywhere on the skin, especially the neck, chest, back, under the arms, under the breasts, or in the groin area. Women are more likely to develop skin tags than men. Skin tags may occur after weight gain and are more commonly seen in middle-aged or elderly adults. Follow the links below to find WebMD's comprehensive coverage about how skin tags develop, how to treat them, and much more.