Hard bumps from injection may be caused by incomplete absorption of local injected drugs, infection, etc., which can be eliminated by local hot and cold compresses, but if accompanied by redness, swelling, pain and other symptoms, it is necessary to take medication, surgical treatment and other ways to eliminate. In general, the local skin hard bumps caused by injection is due to the local incomplete absorption of the liquid after drug injection. In such cases, you can choose to apply cold compresses within 48 hours to reduce the spread of tissue fluid. After 48 hours of localized hot compresses, thus promoting the absorption of the liquid, relieve the symptoms of hard lumps. However, if the patient is accompanied by redness, swelling, pain and other symptoms, it is considered that an infection has occurred, and it is necessary to follow the doctor’s instructions to take oral antibiotic drugs, such as amoxicillin, cefuroxime and so on. If there is an abscess, it is also necessary to take local drainage surgery, so as to eliminate the hard bumps. Patients need to keep the local skin clean and clean, avoid scratching to avoid secondary infection. At the same time, when the next injection of drugs, need to avoid injecting in the hard lumps. Injection hard lumps, it is recommended to go to the hospital, clear the cause of the disease, symptomatic treatment, medication should be used in accordance with medical advice.