The yellow hard skin on the soles of the feet is generally callus, which is a thickening of the stratum corneum induced by long-term pressure and friction. Callus occurs in the palm and metatarsal pressure and friction, the appearance of yellow or wax yellow thickening of the keratinous plaque, flat or slightly elevated, the center is thicker edge of the thin, solid texture, border is not clear, the surface of the smooth and clear skin texture. Localized sweat secretion is reduced, sensory dullness, mostly without self-conscious symptoms, serious cases can be painful. Callus has a certain protective effect, generally without treatment, if you can reduce friction can be relieved. Thicker lesions can be soaked in hot water and then cut with a knife when pain occurs, can also be used externally to exfoliate agents such as sulfur salicylic acid ointment, vitamin A acid ointment. The yellow crust on the soles of the feet may also have other reasons, it is recommended to go to the hospital in a timely manner, so as not to delay the condition.