Salicylic acid ointment has a keratolytic and antiseptic effect, and can be used to treat ringworm of the head, tinea pedis and other diseases. However, if used on a large scale, it may cause salicylic acid systemic poisoning. Salicylic acid ointment belongs to a kind of keratin softener, which can be used for the treatment of tinea capitis, tinea pedis, localized keratosis and other diseases. Some patients may induce contact dermatitis after use; if used over a large area, salicylic acid systemic toxicity may occur, such as dizziness, confusion, shortness of breath, headache, and persistent tinnitus. It is prohibited to use salicylic acid ointment if you are allergic to the drug components in it. It should be noted that salicylic acid ointment should not be used on broken skin; it should not be used on a large area, and should not be used on broken skin and skin with inflammation and infection. It is recommended that patients consult a doctor in the hospital, according to their own actual conditions and follow the doctor’s instructions to use medication, should not be unauthorized use of drugs.