Rash Evaluation
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| Rash Evaluation : What is a rash evaluation? A rash evaluation is a test to find out what is causing a rash. As part of the evaluation, your health care provider will ask about your medical history and your rash. They may ask you if you have started using any new soaps, lotions, cosmetics, or household products. Also, tell your provider if your skin comes in contact with any irritating substances, for example while you are at work or doing a hobby. Your provider will also review your symptoms and examine your skin. They may also order additional tests, such as a patch test, skin culture, or skin biopsy. A rash, also known as dermatitis, is an area of red, irritated, and usually itchy skin. A skin rash may also be dry, scaly, and/or painful. Most rashes happen when your skin touches a substance that irritates it. This is known as contact dermatitis. There are two main types of contact dermatitis: allergic contact dermatitis and irritant contact dermatitis. Allergic contact dermatitis happens when your body's immune system treats a normally harmless substance as a threat. These substances are called allergens. When exposed to an allergen, your immune system sends out chemicals in response. These chemicals affect your skin, causing you to have an allergic reaction to the substance and develop a rash. Common causes of allergic contact dermatitis include: - Poison ivy and related plants, like poison sumac and poison oak. A poison ivy rash is one of the most common types of contact dermatitis. - Cosmetics. - Fragrances. - Jewelry metals, such as nickel. - Rubber, including latex. Allergic contact dermatitis usually causes more itching than pain. Sometimes the rash may not develop until several days after you were exposed to the allergen. A rash may happen after the first time you are exposed to the allergen, or after you have been exposed to it repeatedly. Irritant contact dermatitis happens when an area of your skin responds to an irritating substance. This causes a skin rash to form. Common causes of irritant contact dermatitis include: - Household products such as detergents and drain cleaners. - Strong soaps. - Pesticides. - Nail polish remover. - Body fluids, such as urine and saliva. These rashes, which include diaper rash, most commonly affect babies. Irritant contact dermatitis is usually more painful than itchy. The rash usually develops quickly after exposure to the irritating substance. Irritant contact dermatitis is more common than allergic contact dermatitis. You might be at a higher risk of developing contact dermatitis if you work around irritating chemicals or allergens, for example if you are a hairstylist, mechanic, or construction worker. In addition to contact dermatitis, a rash may be caused by: - Skin disorders such as eczema and psoriasis. - Infections such as chickenpox, shingles, and measles. - Insect bites. - Heat. If you get overheated, your sweat glands can get blocked. This can cause a heat rash. Heat rashes often happen in hot, humid weather. While it can affect people of any age, heat rashes are most common in babies and young children. Other names: patch test, skin biopsy | |
| Review Date: 07/08/2024 | Updated By: |