Keratin is a protein that protects your skin from harmful irritants and infections. Keratosis pilaris is caused by a buildup of keratin on the skin. pain or itching in your genital and anal area.Rash symptoms originate in the place where the infection entered your body, but can spread when you scratch them. Herpes can be transmitted through any type of sexual contact, including vaginal, oral, or anal contact. Genital herpes is a common sexually transmitted virus that can cause rash-like symptoms on your buttocks, anus, or thighs. It typically occurs on parts of your body where skin rubs against skin, such as your butt crack or inner thighs. When sweat gets trapped under your skin, it clogs up pores and causes small pimples to form. Heat rash can also happen any time you sweat a lot.
Heat rash occurs most often, as its name implies, in hot, humid weather. Your skin may feel prickly or itchy, and small bumps may form. Heat rash is a common skin irritation that causes redness and stinging. skin that turns red, swells, and itches more after scratching.skin that weeps clear liquid when scratched.Eczema is most common in babies and children, but it can begin at any age.Īlthough eczema can cause rashes on the buttocks, they are typically seen: