A rash is a change in the skin's color or texture. Simple rashes are called dermatitis, which means the skin is inflamed, swollen, and usually, itchy. Rashes may be caused by infections, allergic reactions to medications or other triggers, and medical conditions such as lupus or rheumatoid arthritis.
Allergic rashes may be triggered by an external agent known as an allergen. Other allergic reactions that present in the skin may be induced by food, medication or other substances taken into the body. After repeated exposure to an allergen, a susceptible individual may develop a skin rash that looks red, itches, blisters, and even gets wet and weepy. Avoidance of the trigger allergen can often relieve the rash completely. Patch testing is a special type of allergy testing offered at SSDP to identify the offending agent.
Some rashes may be easily diagnosed by a dermatologist using history and visual examination. Others may require further testing involving scraping, biopsy, or bloodwork. Your SSDP dermatologist will work with your primary care doctor on the evaluation and treatment of these conditions.