My son has problems with ingrowing toenails and was given the following advice: if the toe-nail is infected, bathe with a weak solution of hydrogen peroxide(v. cheap from chemist), this literally fizzes away bacteria. If you can, grow the toe-nail and then trim it in a straight line, as the shaping is what leaves the sticky-out bits which then dig into your toe. Your local doctor may also be able to treat your toe with phenol, which destroys the nail base, put then you may find the problem just re-occurs. Also try wearing sandals or cotton socks and not-too-tight shoes - if you wear trainers, try and let your feet breathe every now and then. Feet are lovely and useful - so make the best of them!