What causes itchy red bumps on knuckles of hand?

Itchy red bumps on the knuckles of the hand can have several causes. Common causes include:

Insect bites or stings: Insect bites, such as from mosquitoes, fleas, or mites, can cause itchy red bumps on the skin. The bites are usually small and round and can be accompanied by swelling and pain.

Allergic reactions: Allergic reactions to substances such as poison ivy, detergents, or certain foods can cause itchy red bumps on the hands. These reactions are often accompanied by other symptoms such as sneezing, runny nose, or difficulty breathing.

Eczema: Eczema is a skin condition that causes dry, itchy, inflamed skin. It can affect any part of the body, including the hands. Eczema can cause red, scaly patches of skin that are itchy and uncomfortable.

Hives: Hives are a skin condition that causes raised, itchy bumps on the skin. They can be caused by allergies, certain medications, or stress. Hives can appear anywhere on the body, including the hands.

Scabies: Scabies is a skin condition caused by tiny mites that burrow under the skin. It causes intense itching and red, bumpy rashes. Scabies is contagious and can be spread through close contact with an infected person or by sharing personal items.

If you have itchy red bumps on your knuckles, it's important to see a doctor or dermatologist to determine the cause and receive appropriate treatment. The doctor may perform a physical examination, review your medical history, and order tests such as a skin biopsy or blood tests to identify the underlying cause.