Cellulitis is generally referred to as cellulitis, three-year-old children can take cephalosporin for cellulitis, and if necessary, surgical treatment and so on as prescribed by the doctor. Cellulitis is a bacterial infection of the deep tissues, and patients can usually be treated with antibiotic medications such as penicillin or cephalosporin as prescribed by their doctor. Therefore, it is possible to take cephalosporin after cellulitis in a three-year-old child. If the patient is suspected to have a combination of anaerobic bacterial infection, then the patient can also be treated with antibiotic drugs such as metronidazole, tinidazole, ornidazole under the guidance of the doctor. Patients with cellulitis also need to undergo abscess incision and drainage under medical supervision in case of abscess formation. For cellulitis of the floor of the mouth and submandibular, if anti-infective treatment is ineffective in a short period of time, incision and decompression are also needed as soon as possible to prevent laryngeal edema and even asphyxia. In the case of cellulitis of the fingers, early incision and decompression is also needed to prevent phalangeal necrosis. It is recommended that a three-year-old child with cellulitis take cephalosporin and other drugs strictly under the guidance of the doctor for treatment, and do a good job of their own care.