Hives ICD-10: L50.9

Causes, Symptoms, and When to Take Action Hives, or urticaria, are itchy, raised welts on the skin that appear suddenly and often disappear within hours. They are a common allergic skin reaction. How It Looks Texture: Raised, swollen patches or welts (wheals) Color: Red or skin-colored Shape: Round or irregular; individual welts change shape, move, merge, or fade and reappear elsewhere Location: Can appear anywhere on the body; may shift over time Why Does It Appear? Triggered by many possible causes: allergens (foods, medications), insect stings, infections, physical factors (heat, cold, pressure), stress. The reaction happens when certain cells in the skin release histamine and other chemicals, leading to swelling and itching. Should You Be Concerned? Most cases are harmless and resolve on their own. But see a doctor if: The welts persist for weeks or more (chronic hives) Swelling involves lips, tongue, or throat You have difficulty breathing or other systemic symptoms The rash is painful, widespread, or doesn't improve Can You Prevent It? Avoid known triggers whenever possible Maintain awareness of what you eat, medications you take, or environmental exposures Use loose clothing and avoid excessive heat or pressure in sensitive areas 👉 How Piel AI Can Help Piel AI can help you monitor how welts appear, change, and resolve over time through regular photos. While not diagnostic, it aids in recognizing patterns and determining when to seek care. Summary Hives are itchy, raised welts caused by a skin reaction to various triggers. They can appear anywhere, shift locations, and vary in shape and duration. Usually harmless, but persistent or severe cases require medical evaluation. Avoiding triggers and observing changes are key approaches.