basal cell carcinoma
"When treating for Basal Cell Carcinoma, in my case the arm, HEED THE WARNING to not use on sore or broken skin, which should include recently biopsied lesions to avoid any confusion. Wait until the excision site has healed. I did not receive this instruction and began using it that night. The pain was beyond description, reached deep into the muscle tissue, and lasted for hours.  Follow-up phone calls of course confirmed the oversight. "