Medically reviewed by Marisa Garshick, MD Key Takeaways A callus is a hard and thick patch of skin caused by friction or pressure, often on hands or feet.Calluses can be treated with salicylic acid, a ...

I have found myself at that point in the summer where my feet are absolutely wrecked. After months of walking around in unsupportive, feet-exposing sandals, they are in serious need of some TLC.