Red marks on the skin caused by allergies are hyperpigmentation. It can be eliminated through general treatment, topical medication, physical therapy and other measures. 1. General treatment: you should keep the skin clean and hygienic, wear loose, comfortable, soft clothes, reduce local friction stimulation, at the same time, go out and pay attention to sunscreen, eat more fresh vegetables and fruits, eat less fried, pickled, smoked ingredients, ensure enough sleep, regular diet. 2. Topical medication: Topical vitamin E ointment, hydroquinone cream, cumene glycoside ointment, etc., has a certain auxiliary effect on the treatment of skin red marks. 3. Physical therapy: you can take physical therapy measures such as laser, through the specific thermal effect of laser to remove the local pigment. Allergy-induced skin red marks, need to go to the regular hospital in time to treat, follow the doctor’s prescription medication.