Skin allergy after vaccination with HPV 9 can be treated with topical medication, oral medication and daily attention. 1. Topical medication: If mild erythema, papules, itching is not heavy, can be used externally with glycerite lotion. If the lesions are heavy, topical corticosteroid ointment, such as halometasone, mometasone furoate, etc., can be chosen. 2. Oral medication: Oral anti-allergic drugs can be chosen, preferred second-generation antihistamines with fewer adverse reactions, such as cetirizine, loratadine and so on. 3. Daily attention: rest, light diet, avoid triggering other allergic reactions, such as allergic reaction is more serious, should be suspended or stop the subsequent vaccination. If systemic symptoms are severe, such as dyspnea, fever, etc., go to the hospital in time to avoid self-treatment.