What's Causing My Rash?
By Advanced Desert Dermatology
July 22, 2016
Category: Dermatology
Tags: Eczema   rash   hives  

Learn about common types of rashes and their causes from your Peoria dermatologist.

Concerned about an itchy, red rash? Dr. Vernon Mackey, your Peoria, AZ dermatologist, shares information about several common rashcauses of rashes.

Contact dermatitis

Contact dermatitis occurs when your skin comes in contact with an irritating substance, such as an allergen, irritant or chemical. The rash usually disappears in about two to four weeks as long as you are no longer exposed to the allergen or irritant. Contact dermatitis can occur if you come in contact with poison ivy or other poison plants, or have a reaction to perfumes, lotions, soaps, hair dyes, cosmetics or rubber. Some people are sensitive to nickel found in gold and metal jewelry, belt buckles, buttons and zippers, and develop rashes after exposure.


Hives causes red, itchy welts, usually on the trunk of your body, although they can affect other areas. They tend to appear if you experience an allergic reaction to insect bites, foods or medications. Some people also notice them when exercising or after exposure to hot or cold temperatures. Hives usually aren't serious, although they can block your airway if they develop in your lungs, throat or tongue. Hives typically last 30 minutes to several days and are usually treated with antihistamines.


Eczema causes itchy, red, dry skin. If you have the condition, you may develop red bumps that leak fluid, then crust over. Eczema can be caused by a variety of factors, including genetics, immune system problems, irritants, allergens or environmental conditions. People who have hay fever or allergens may also have eczema. Corticosteroid creams and gels, antihistamines and prescription medications can help relieve your symptoms.


Rashes can also accompany illnesses. They're more common in children, but can occur at any age. If your rash is accompanied by a fever or other signs of illness, an virus is probably to blame. Unnamed viruses can trigger a rash, in addition to fifth disease, chicken pox and roseola. Rashes caused by viruses will gradually fade as you recover from the illness.

Are you concerned about a rash that just won't go away? Call Dr. Mackey, your Peoria, AZ dermatologist, at (623) 977-6700 to schedule an appointment to discuss treatment options.