Oral vitamins are not effective in treating skin allergies. To improve the problem of skin allergies, you can use cold compresses, dietary adjustments and away from allergens and other ways. 1. Cold compress: cold compress can play the purpose of itching, swelling, but the time of cold compress should not be too long, each time in 3-5 minutes or so is good, can be repeated several times. 2. Dietary regulation: skin allergies, diet should be light, reduce spicy, stimulating food intake, to prevent allergies aggravated. 3. Stay away from allergens: Go to a professional organization for an allergen check to find out where the source of the problem lies, and stay away from allergens as much as possible to reduce the symptoms of skin allergies. Skin allergies can not be treated by oral vitamins, if the skin allergy phenomenon is more serious, or for a long time did not get better, then you should go to the hospital as soon as possible dermatology consultation, under the guidance of professional doctors to the cause of the treatment.