I thought I had a thorn in my left foot (fleshey outside) so after a few days of feeling it I decided to try to get it out...I cut around it with a straight pin and really couldn't see anything so I gave up. Since then it has formed a hard callus and has become more painful. I did 4 aerobics class in a row last week and now both my feet are so sore I can barely stand it. I have somewhat low arches. The balls of my feet hurt and also the heel. Now to top it off I can feel a sopt on my right foot that feels like the original spot felt but I will not doctor myself. It is a thorn or something or is there a condition that can occur?