In reply to purple sue:
I had my big right toe stamped on whilst dancing during our wedding. On Honeymoon in Istanbul this area swelled up (hot country, lots of days walking on touristy trips) and turned purple and started to ooze puss. I had suffered from in-growing toenails regularly previously and kept having them trimmed. A waste of time. At the "American Histanesi" I was seen by Dr. Ahmed "the Butcher" who I had seen whilst waiting yelling at patients and causing children to cry and scream in abject fear. He spoke no English, and I had no idea what was going to happen. Without much preamble he started by scraping my toe bone with the needle of the local anesthetic syringe, then merrily chopped a slice down the side of my toe off including cuticle and nail bed. Four stitches later I was introduced to an English speaking nurse who translated that I was not to walk on it for a month. This was day 4 of a month's Honeymoon!
"Unfortunately" this meant lots of lying down :-D
I have never had a problem since. A biopsy removing a slice down the edge of the toe sounds terrible, but it has worked and no more problems. That was 30 years ago.
The "shave biopsy" in this image:
https://image.slidesharecdn.com/nailbiopsy-150508121255-lva1-app6892/95/nai...