Medically reviewed by Daniel More, MD Pictures of hives, also known as urticaria, can help you to identify these raised, red, itchy bumps or welts. Causes include stress, infections, food or latex ...

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Skin reactions can be alarming, especially when they appear suddenly. Many people struggle to tell the difference between hives and a rash, but knowing the cause is the first step toward relief.

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The cause of rashes can vary, spanning allergic reactions, infections, autoimmune diseases and environmental irritants.