Allergies. Urticaria & Angioedema. Pictures of Hives to Help Identify a Rash. How to Recognize the Different Types. By Heather L. Brannon, MD. Updated on July 20, 2023. Medically reviewed by Daniel More, MD. Print. Hives, also known as urticaria, are a type of skin rash with raised, red, itchy bumps or welts. See more