When a patient develops a cosmetic allergy, the mild symptoms usually heal themselves in about a week. If it causes a breakdown of the skin barrier, prompt treatment is required and it usually takes 6-8 months or more to recover. In case of cosmetic allergy, it is important to stop using the cosmetic immediately and to take better care of the affected skin. The time required for healing varies depending on the severity of the condition. If the patient’s symptoms are mild, with only mild localized peeling, itching, and red spots on the face, no treatment is usually needed and the condition can heal on its own in 7-10 days. If the symptoms are more extensive, it is more difficult to rely on the autoimmune ability to heal by itself. If the allergy has damaged the barrier function of the skin or formed hormone-dependent dermatitis, recurrent allergy and sensitivity may occur and complete treatment will take more than six months. Patients are advised to pay attention to skin protection and avoid stimulation by sunlight and external dust, etc. At the same time, the diet should be kept light and more vitamin-rich foods should be consumed, which can help improve their resistance and help relieve allergy symptoms.