Sudden itchy redness and hard lumps on the face may be caused by artificial urticaria, papular urticaria, folliculitis, etc., which need to be treated with oral medication and medication under the guidance of a doctor. 1. Artificial urticaria: Artificial urticaria is caused by mechanical stimulation of the skin such as scratches or trauma and the appearance of stripes or wind. It is characterized by redness, swelling and hardness with itching, which can be treated with topical glycerite, oral loratadine tablets, ebastine tablets and other drugs. 2. Pemphigus urticaria: Pemphigus urticaria is an allergic reaction that occurs after being bitten by an insect, the saliva injected into the skin during the bite of the insect will lead to an allergic reaction in the human body, resulting in a sudden itchy redness, swelling and hardness on the face. You can apply erythromycin ointment, compound dexamethasone acetate cream and other ointments for treatment. 3. Folliculitis: manifested as red congested papules or pustules consistent with the mouth of the hair follicle, surrounded by redness with inflammation, appearing on the face suddenly itchy symptoms of redness, swelling and hard lumps. Antibiotics can be used as appropriate, local topical neomycin ointment, mupirocin ointment, fusidic acid ointment, but also a trial of ultraviolet radiation treatment. Sudden redness and itching on the face can also be seen in other causes, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, follow the doctor’s instructions, do not unauthorized use of drugs. Do not eat spicy food, such as chili peppers, mustard, etc. during the treatment period, so as not to aggravate the condition. The above drugs should be used under the guidance of a doctor.