Salicylic acid can treat foot fungus, but can only play an auxiliary role. 1. Foot fungus: it is a fungal infection of the foot skin caused by dermatophytes, which manifests itself as dryness, peeling, blisters, vesicles and other symptoms on the surface of the skin, accompanied by itching. 2. Salicylic acid: Salicylic acid is an antifungal drug that can inhibit the growth of fungi and also has the effect of exfoliation. Foot fungus is due to fungal infections, if the patient’s clinical symptoms are accompanied by scaly keratinization, the local use of salicylic acid, can play a role in inhibiting the role of fungi, but also be able to remove keratin. However, only 3% to 6% concentration of salicylic acid can treat foot fungus, due to the low content of salicylic acid, resulting in a slight bacteriostatic effect, can only play an auxiliary role, need to be combined with the use of antifungal drugs for treatment. Salicylic acid is suitable for patients with scaly keratosis pilaris, and should not be used for patients with blistering and erosive foot odor due to strong irritation. In the process of use, the skin at the site of the drug may appear edema, erythema, papules, itching and other adverse reactions, it is recommended to use under the guidance of a doctor, and should not be used without authorization.