Obvious causes: e.g. long-term topical corticosteroids. This is abuse without the guidance of a dermatologist. Hidden causes: e.g. long-term application of blemish creams, skin lightening and wrinkle products. Once the product has a faulty formulation (containing corticosteroids) or is used inappropriately, symptoms of hormonal dependence can occur after discontinuation of use. Suspicious reasons: such as individual beauty salon products, anti-skin allergy products, whitening masks, acne products, etc.. The reason why individual products are “suspicious” is that there is no strict legislation in this area, and hospitals are not obliged to test the ingredients of products. For example, if a cosmetic product has a therapeutic (acne, spots), this is a drug, without a doctor’s prescription can be used directly for consumers? As there is no evidence of testing, the doctor’s answer is also very cautious.