Wearing sandals to cause foot odor is often caused by a variety of factors, common factors include living habits, fungal infections, allergic reactions and so on. 1. Lifestyle habits: summer weather is hot, sweating more easily lead to breeding bacteria, and sandals can not absorb sweat, so long-term not wash your feet, do not pay attention to foot hygiene often cause foot odor. In daily life, you need to wash your feet diligently to maintain foot hygiene. 2. Fungal infection: hot and humid environment is the trigger of tinea pedis, the main symptoms include dry skin cracking, local blisters with itching and foot odor. The main symptoms include dry and cracked skin, localized blisters with itching and smelly feet, etc. It is mainly treated by medication, such as miconazole, terbinafine and salicylic acid. Need to choose the right drug under the guidance of the doctor. 3. Allergic reaction: the poor quality of sandals, pigments, glue and other substances will stimulate the skin of the feet, serious allergic reactions lead to erythema, itching, foot odor and other symptoms. It is necessary to replace the sandals with better quality in time and pay attention to foot hygiene. When patients experience discomfort, they should go to the hospital immediately.