I undergone cryotherapy last week because I have several corns on my right foot,and the doctor prescribed tetracycline cream too.the corns are still present and Its itchy and I feel pain sometimes,.i've noticed small black spots around the corns and im so worried about it.i would like to ask if those black spots are sign that my corns are getting worst?or its a sign of healing?i hope u can answer my query.thank u.