How long it takes for skin allergies caused by eating seafood to heal themselves generally depends on the degree of skin allergy and the time it takes to remove the allergen. Skin allergy caused by eating seafood is mainly due to the fact that seafood contains a large amount of xenobiotics, which directly or indirectly activate the immune response in the body, resulting in various types of skin rashes, which may also be accompanied by itching and tingling. In general, if only a small number of rashes appear locally on the skin, without other combined symptoms, they can heal themselves 24 hours after stopping seafood consumption. If the rash is large or combined with other systemic symptoms, the rash will last longer and disappear gradually in about 3-5 days. After the occurrence of seafood allergy, you should stop eating seafood in time, and do not scratch or repeatedly rub the skin after the rash appears to avoid skin infection after the rash breaks out, resulting in the allergy phenomenon is prolonged. At the same time, we should strengthen skin care and keep the skin clean and moist. During the period of skin allergy, try to wear breathable, loose cotton clothing.