Discovering an unexplained rash on your skin can be concerning and uncomfortable. Skin rashes appear in many forms—redness, bumps, blisters, or dry, flaky patches—and can cause itching, pain, or irritation. Understanding the potential causes of an unidentified skin rash helps determine the appropriate treatment and when to seek medical advice.

One of the most common causes of a rash is contact dermatitis. This condition arises when the skin reacts to irritants or allergens, such as soaps, detergents, perfumes, or plants like poison ivy. The rash typically appears on the area exposed to the trigger and is characterized by redness, swelling, itching, or blistering. Avoiding the irritant usually helps the rash clear up.

 

Allergic reactions are another frequent cause. Foods, medications, insect bites, and environmental allergens can trigger rashes. Allergic rashes often appear as hives—raised, red, itchy welts that may shift location on the body. Severe allergic reactions may cause swelling and breathing difficulties and require urgent medical attention.