This has been alluded to before but it seemed reasonable to start a new thread for this specific problem. I'm 37 and have never had any problems of this nature until recently. I've always cut my toenails square across as far as possible but some months ago my right big toenail split on its left hand front edge. To remove the splinter I had to trim it round into the corner. Since then, this corner has started to thicken and dig into the flesh. It's still what I think could be called an incipient problem in that it hasn't become critical. However, it's got really annoying over the last few days so I looked it up and found that it is what the docs call an ingrowing toenail. I'm going to get an appointment tomorrow as it seems that the earlier this is treated the more successful the outcome. There is a good description of the problem here: http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=197 and a good illustration of how to trim your toenails: The true chronic ingrown toenail can look like this: so get onto it right away! Worth being a sticky I think.