Salicylic acid can usually treat corns, but it needs to be used under a doctor’s supervision. Corns generally refer to local long-term friction and pressure leading to keratosis, usually, salicylic acid can treat corns. Salicylic acid belongs to the local exfoliation agent and disinfection antiseptic, commonly used in the treatment of tinea capitis, tinea pedis and local keratosis, with dissolving keratin, itching and sterilization and other functions. Any drug may have certain side effects, some patients may experience skin irritation and contact dermatitis after using salicylic acid externally, and dizziness, confusion and mental disorientation may also occur after large-scale use and absorption. For people who need to use salicylic acid, it is recommended to go to a regular hospital to consult a doctor, under the guidance of the doctor to use the drug, do not use the drug without authorization. It should be noted that the person who is allergic to the product is prohibited, and the person who is prone to allergies should be cautious.