Rashes in the groin or genital area are usually caused by
irritation of the skin from many sources, such as clothes rubbing against the
skin. Rashes that occur without other symptoms are usually minor and often go
away with home treatment.
A common cause of a rash is
contact with a substance that causes irritation or an allergic reaction (contact dermatitis). People who work with soaps,
solvents, or detergents might splash these liquids onto their clothes at waist
level. Over time, the body can develop allergies to these substances.
Psoriasis. There are two types of
genital psoriasis: inverse and penile. Inverse psoriasis causes bright red
patches and may be itchy. Penile psoriasis causes pale red, scaling patches,
and does not itch or burn.
Sexually transmitted infections (STIs). Sores, blisters, or ulcers, especially in the groin or
genital area, may be the first symptom of several STIs. If you have a rash or
growths in the groin or genital area, do not have sexual contact or activity
until you have been evaluated by your health professional. This will reduce the
risk of spreading a possible infection to your partner. Your sex partner may
also need to be evaluated and treated.