Erythromycin ointment does not cure tendonitis. Erythromycin ointment is an antibacterial drug used to treat localized skin infections, such as purulent skin diseases, small skin burns, ulcer infections, and common acne. Tendinitis, on the other hand, is a fatiguing, aseptic, laborious inflammatory condition, so erythromycin ointment has no therapeutic effect on tendinitis. Tenosynovitis recommended oral non-steroidal anti-inflammatory drugs, such as diclofenac sodium extended-release tablets, celecoxib capsules, etc.; local application of anti-inflammatory and analgesic ointment, such as loxoprofen sodium gel cream, flurbiprofen gel paste, etc.; local closed injection of medication, such as lidocaine hydrochloride injection, compound betamethasone injection, hydrocortisone injection, etc.. However, the above medications can only relieve the symptoms of tenosynovitis and cannot treat tenosynovitis fundamentally. If you need to treat tenosynovitis or use erythromycin ointment, please consult a professional doctor and follow the doctor’s instructions, do not blindly use drugs.