The soles of the feet grind out bubbles, how to judge whether they are corns?

According to your question, the explanation is as follows:

The blisters on the soles of the feet are not the same as corns. The bubbles ground from the soles of the feet are shallow and contain liquid, and their shapes are large and small and irregular. Secondly, the corns are generally round, with thick skin around the center of the garden and a deep center in the middle. Generally, there is no liquid inside. This is the difference between bubbles ground from the soles of the feet and corns.