The causes of children’s knee bumps include eczema, synovitis, etc. The treatments include medication and surgery. 1. Eczema: children’s knees can appear small bumps, mainly through drug treatment such as hydrocortisone butyrate ointment, pimecrolimus ointment and so on. 2. synovitis: children can also appear to have small bumps on the knee, mostly caused by infection, autoimmunity, metabolism and other factors, the treatment includes medication such as ibuprofen, celecoxib, etc. to control inflammation and relieve pain; if there is a bacterial infection can be used penicillin, ceftolozolin, vancomycin and other drugs. In severe cases, the lesion can be removed surgically. When the child becomes unwell, he should go to the hospital immediately. Appropriate medications need to be chosen under the guidance of a doctor.