I had no idea there was a medical term for ingrown toenails. Maybe I'll surprise my podiatrist by asking for onychocryptosis treatment during my next appointment. Every so often, I develop fungal nail infections that must be treated by a professional. It all started with an untreated ingrown toenail.
The only advice I have for people is to only trim the top portion of your toenails, and only straight across. Trying to trim the sides of the toenail, like you might with fingernails, can create sharp corners that will dig into your skin and become ingrown.