The causes of skin allergies in the morning are mostly due to environmental factors and skin care product stimulation. 1. Environmental factors: ① indoor environment is too cool and humid, will lead to skin rashes, itching and other allergic symptoms. ② Skin allergic reaction to dust, mites, lint, hair, etc. on the bed sheets and bedding, skin redness, rash, itching and other symptoms. 2. Skin care products stimulation: the use of improper skin care products or skin care products with special ingredients will produce skin stimulation reaction, resulting in skin allergy symptoms. To address the causes of previous allergies, you need to regularly wash and disinfect bed sheets and bedding; adjust the temperature and humidity of the room; use mild skin care products; in addition to a balanced and light diet, exercise to improve the body’s immune system.