Hair dyeing can lead to scalp allergies, infections and other injuries, the appearance of obvious itching and pain should be stopped perm dyeing, need to be treated according to the specific circumstances of the symptomatic treatment, usually based on drug therapy. 1. In the process of dyeing hair due to hair dye ingredients or personal constitution sensitivity degree is different, there may be contact dermatitis and other scalp allergies, will be accompanied by obvious scalp itching and dandruff and other conditions, need to stop dyeing hair in time, and rinse clean hair dye. If the symptoms are not relieved, you can use topical glucocorticoid creams such as hydrocortisone butyrate cream, combined with oral antihistamine drugs such as loratadine. 2. Due to the process of hair dyeing and perm dyeing, the scalp acid-base and local micro-environment will have a certain impact, resulting in a water-oil imbalance and barrier function is weakened, this condition may appear scalp infection, or even abscess formation, to timely medical treatment to be coated with or oral penicillin and other antibiotics, abscess formation also requires surgical incision to drain pus and other treatments. It is recommended for sensitive body, scalp oil balance problems and scalp damage, to avoid perm dyeing and other behavior, if there is obvious damage to timely medical treatment. The above drugs need to be used in accordance with medical advice.