Overall the best course of action to prevent hives is to simply avoid the allergen that is causing the reaction. Be sure to choose cleansers and moisturizers that are for sensitive skin and sunscreens are free of fragrances and dyes. If you do come into contact with an allergen, avoid scratching and don’t use any harsh soaps or detergents that may dry skin.
Taking an anti-histamine can treat most cases of hives. Diphenhydramine is considered the most effective medication. If you’re unsure of what’s causing the irritation see an allergist who can help you find out the source and how to effectively treat it.