There is a hard skin under my toes, which is similar to calluses. It hurts when you touch it, and it hurts when you walk away.

Just look at the pictures, you need to consider the calluses caused by excessive proliferation of skin keratin caused by long-term friction. It is suggested to reduce friction, pay attention to observation and do not need special treatment. If you really want to remove it, you can soak it in hot water and scrape it off with a knife. Exfoliators such as sulfur salicylic acid ointment and tretinoin ointment can also be used externally, but if it is not clean, it is easy to bleed and infect, so you need to pay attention.