In rare cases, a food allergy causes the rash. When a rash appears around the mouth, it can be itchy or cause a burning sensation. The rash may appear red on light skin but be skin-colored on dark ...

A rash that consists of hives indicates an allergic reaction, Dr. Ungar says. More specifically, it points to a food allergy and it often appears with intense itching. In some cases swelling might ...

DEAR DR. ROACH: About 45 years ago, I came down with a rash on my chest and stomach from taking ampicillin. I was told never to take penicillin again. I’m allergic to many antibiotics, which ...