Contact dermatitis is a common cause of a rash in one area. This is especially true of a small rash that will not go away. Contact dermatitis usually starts as raised red spots. It can change to ...

Pink-red, scaly rash on inner thighs near groin. Often, starts in the groin crease. Then, spreads slowly downward. In boys, the rash does not involve the penis or scrotum. Rash is most often the same ...

The first exposure sensitizes your body to the allergen, while the second exposure causes the rash. View the slideshow below for photos of irritant contact dermatitis and allergic contact dermatitis.