Skin allergies are not contagious. When skin allergies occur, it is essential to identify the allergen and determine the cause. Skin allergies often manifest as dermatitis, eczema, urticaria, and other allergic diseases, and can also present as diseases such as angioneurotic edema. Common symptoms include itching, papules, swelling, and rash patches, but there is no need to worry too much as they are not contagious.