Why do I have a red bumpy rash on my arm?

Keratosis pilaris, commonly known as “chicken skin,” is the most common cause of bumps on your arms. This condition is characterized by small red or brown bumps that develop on the backs of your upper arms. They may also occur on the backs of your thighs and the buttocks.

When should I worry about a rash on my arm?

Painful rashes should quickly be evaluated by a physician. The rash is infected. If you have an itchy rash and you scratch it, it may become infected. Signs of an infected rash are yellow or green fluid, swelling, crusting, pain, and warmth in the area of the rash, or a red streak coming from the rash.

What can cause underarm rash?

Underarm rash due to inflammatory or allergic causes. Developing underarm rash could be caused by contact dermatitis, and some of the triggers that are common may include: Detergents, cosmetics, deodorant, soaps, shaving creams, perfume, powder, or dyes.

Why are my underarms red?

A heat rash under the arms caused by extremely hot or humid temperatures may present as a red inflammation of the armpit region. This common condition is usually caused by blocked sweat glands. It can appear with itchy or burning small bumps that may blister. Once the body has cooled, the rash usually disappears.

What causes a rash on one arm?

Many medical conditions can cause skin rashes on the arms and legs. But a red rash confined to one arm usually indicates a local process as opposed to a widespread medical condition. Allergies, infections and contact with irritating chemicals often cause skin reactions, leading to a red arm rash.

What causes hives under the armpit?

Most painful armpit rash cases are the result of an allergic reaction such as hives or eczema, shingles, ringworms, hidradenitis suppurativa, or a staph infection. A painful rash in the underarm region may be caused by a bacterial infection of the lymph nodes.