Why does hives appear on the skin? These are surprising factors that you don't know.

Allergy: food allergens (such as crustaceans, nuts or milk), medicines (such as antibiotics and analgesics) and insect bites are common triggers.
Physical factors: Temperature changes, skin pressure, strenuous exercise or exposure to sunlight may cause hives in some people.
Stress: Emotional stress can be an important trigger, as it affects the immune system.
Infections: Certain viral or bacterial infections may trigger hives.
Autoimmune diseases: in some cases, urticaria may be linked to underlying autoimmune diseases.
How to avoid urticaria?

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