This kind of skin inflammation with swollen red itchy
patches all over the body is the most common form of allergy rash
. The most common causes are certain foods like berries, shellfish, fish, nuts, eggs, milk, and others, medications, cosmetics, metals like nickel, emotional stress, exposure to water, sunlight, cold or heat, insect bites and
Usually, skin rashes are not harmful and last only for few days.