Smelly feet are mainly caused by excessive secretion of sweat that cannot be washed in time or fungal infections, and thus the feet will still smell bad after washing. 1. Excessive secretion of sweat: foot skin sweat gland secretion abnormal, exuberant, but failed to get timely cleaning, the skin surface bacteria will decompose the organic substances in the sweat, thus appearing foot odor symptoms. Therefore, foot washing can only temporarily reduce foot odor, if you wash the secretion of sweat is not cleaned in time, there will be odor. At this time, you can use 2% to 3% formaldehyde solution, 0.1% of the new cleaner solution to relieve the symptoms of local sweating. 2. Fungal infection: fungal infection leads to tinea pedis, aggravating the symptoms of foot odor. At this time, you can use topical ketoconazole ointment, and with oral antifungal drugs (such as terbinafine tablets) treatment. The above drugs should be used under the guidance of a doctor. During the treatment period, socks should be changed and breathable shoes should be worn to keep the skin dry and breathable, and the drugs should be reasonably applied according to the doctor’s instructions.