Researchers from the National Institute of Allergy and Infectious Diseases (NIAID) are conducting a clinical trial designed to help understand rare but potentially serious systemic allergic reactions ...

A malar rash is a red rash that appears across the face. It can be flat or have raised bumps. One sign of a malar rash is that it usually doesn't affect the folds of skin that run from your nose to ...

A common symptom of Lyme disease is a bullseye-shaped rash. However, many other conditions may cause a similar rash, including ringworm, fixed drug reactions, and allergic reactions to insect bites.

Urticaria pigmentosa — also known as maculopapular cutaneous mastocytosis (MPCM) — is an itchy rash that shows up most often in children and young adults. The rash may look reddish-brown, gray, ...

According to Misha Rosenbach, MD, other terms for such reactions include anticonvulsant hypersensitivity syndrome, drug-induced hypersensitivity syndrome, hypersensitivity syndrome, and drug-induced ...

Medically reviewed by Katlein Franca, MD Key Takeaways An inner-thigh rash can be caused by friction, allergic reactions, or a skin condition.Eczema is a chronic condition that causes dry, scaly ...

Photosensitivity or abnormal light sensitivity is very complex and is a major symptom of lupus. The American College of Rheumatology (ACR) loosely defines photosensitivity as "a skin rash as a result ...

Hives usually aren’t a sign of a serious medical condition. But their sudden appearance may merit a trip to urgent care or the emergency room if they show up along with other symptoms. Hives are itchy ...

Some people with COVID-19 may develop a rash. The type of rash varies from person to person. Certain rash types may suggest a more severe infection. COVID-19 is the disease caused by the SARS-CoV-2 ...