Medically reviewed by Daniel More, MD Key Takeaways Hives can cause red, itchy bumps or welts on the skin.Hives might be ...

Exercise-induced urticaria (EIU) is a rare condition in which a person experiences hives triggered by exercise. It can make physical activity more difficult, but some tips can help you stay active.

Medically reviewed by Jenny Sweigard, MD Key Takeaways A mono rash often appears as red or pink flat areas with small bumps.The rash can be triggered by antibiotic use, especially amoxicillin. A mono ...