Petechiae are red or purple dots on the skin that happen when tiny blood vessels called capillaries break under the skin's surface, creating a petechial rash. A petechial rash is caused by ...

If the sweat gets blocked from coming to the surface of your skin, small lumps that look like blisters can form. They might be red or filled with clear liquid. The bumps can feel itchy or painful.

you may only see brown plaques in dark skin.” If you notice tiny, rough red spots on your skin—especially on your upper arms, thighs, cheeks, or buttocks—you may be dealing with keratosis ...