Q: I recently developed an excruciating pain on the bottom of my foot. One day, I felt fine with no tenderness at all and the next I was unable to put any weight on it without searing pain. There is a ...

A cyst is a sac or cavity that may be filled with pus, semi-solid material, or air. It doesn’t usually cause pain until it gets large. An abscess is a painful, red infection that’s filled with pus. A ...

A dermoid cyst is a sac of cells containing tissues that are usually present on the skin’s surface. They form during fetal development and grow slowly, so a person may not notice them until late ...