Tendovaginitis is the proliferation of connective tissue in the tendon sheath, which belongs to sterile inflammation, and erythromycin ointment belongs to the topical medicines, which can not be treated. Tendovaginitis is an inflammatory reaction due to edema of the tendon sheath tissue caused by prolonged and excessive friction and stimulation and compression, chronic strain is the main triggering factor, which can lead to local pain and pressure, as well as limited local flexion and extension activities, which is aseptic inflammation. Erythromycin ointment is mainly used for the treatment of bacterial-induced mild-to-moderate skin and soft tissue infections, is a topical application of medicines, so erythromycin ointment can not be used for tenosynovitis, the treatment is meaningless. Tendovaginitis patients can take oral non-steroidal anti-inflammatory and analgesic drugs such as diclofenac sodium, nimesulide capsules, etc. to relieve pain symptoms and reduce inflammatory reaction, daily attention should be paid to rest, reduce the local stimulation, and the serious cases may also need surgical treatment. After the appearance of tenosynovitis, it is recommended that patients actively seek medical advice, standardized treatment under the guidance of the doctor, and the use of drugs as prescribed by the doctor.