A persistent rash needs to be evaluated by your general doctor or a dermatologist, a skin doctor.
Hives (urticaria) are red, itchy, raised areas of the skin that can range in size and appear anywhere on your body. The cause of the hives can be drugs, foods, stress, and is unknown in many cases. The fact that the rash appears anywhere on your body suggests this diagnosis. Hives are an allergic reaction and those with asthma and allergies are more prone. If the cause of your hives can be identified, you should avoid that trigger. Some drugs and foods take days to leave the body, so your doctor may prescribe antihistamines in the meantime to relieve your symptoms.
Contact dermatitis is another possible explanation for your rash. This rash occurs when certain substances come into contact with your skin. Contact dermatitis causes a localized rash on the skin which may be red, sore, itchy, and have bumps or blisters. There are two kinds of contact dermatitis: irritant or allergic.
Irritant contact dermatitis is more often painful than itchy, and is caused by a substance damaging the part of your skin where it comes into contact. Contact with acids, soaps, detergents, fabric softeners, or other chemicals may cause irritant contact dermatitis. The reaction often occurs on the hands and is frequently work-related.
Allergic contact dermatitis is caused by exposure to a substance or material to which you have become extra sensitive or allergic. Common causes include fabrics, clothing, soaps, and nail polish. Rubber gloves are one of the most frequent causes of occupational allergic contact dermatitis, especially in health care workers.
Seeking professional help from your doctor is the safest way to determine what is causing your rash.
This answer should not be considered medical advice...This answer should not be considered medical advice and should not take the place of a doctor’s visit. Please see the bottom of the page for more information or visit our Terms and Conditions.
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