There are a variety of causes that can lead to a red bag on the face generally considered to be caused by acne, folliculitis, insect bite dermatitis, hemangioma, eczema and other causes. 1. Acne: caused by Propionibacterium acnes infection, blockage of hair follicles, sebaceous gland ducts and other factors. It can be manifested as small red bumps on the face, accompanied by nodules, cysts, pimples and other manifestations. 2. Folliculitis: due to inflammation of the hair follicles, it can be manifested as red packets on the hair follicles, accompanied by redness, swelling and pain. 3. Insect bite dermatitis: due to the allergic reaction caused by mosquito bites, it can appear on the face and red bags, accompanied by itching and other manifestations. 4. Hemangioma: it is caused by abnormal proliferation of blood vessels and belongs to the nature of vascular malformation or misshapen tumor. It can be manifested as a red bag on the face, and will gradually increase in size, usually without pain, itching and other manifestations. 5. Eczema: due to allergy or contact with physical and chemical factors, it can be manifested as red bumps on the face, which may be accompanied by itching and other manifestations. Need to go to the hospital, a clear diagnosis of the cause of the targeted treatment, you can not just randomly use drugs.