Hair follicles can become irritated or infected due to shaving, sweating, friction, bacteria, or fungi. The result is small red bumps that often resemble pimples.
These bumps may itch, become tender, or contain a small amount of pus.
People who exercise frequently, wear tight clothing, or shave regularly may experience folliculitis from time to time.
Fortunately, many mild cases improve with good hygiene and proper skin care, although persistent or severe cases may require medical treatment.
Insect bites are another frequent explanation.
Mosquitoes, fleas, bed bugs, mites, and other insects can leave behind clusters of small red bumps. Unlike cherry angiomas, these usually itch and often appear suddenly after spending time outdoors or in areas where insects are present.
The location of the spots and the presence of itching often provide important clues.
Allergic reactions may also produce red spots or rashes.
New soaps, laundry detergents, perfumes, lotions, cosmetics, medications, foods, or plants can all trigger allergic skin reactions in some people.
These reactions often cause itching, redness, and sometimes swelling.
Once the triggering substance is removed, many mild allergic rashes gradually improve.
Heat rash is another possibility, particularly during hot weather.
When sweat glands become blocked, tiny red bumps can develop, especially under tight clothing or in areas where skin rubs together.
