





It looks like a very nasty case of fungal infection. It probably will be quite difficult to treat but do look at the nail fungus treatments in your pharmacy/chemist. Dont buy the cheapest. If you have any success it will take 18 months or more to start showing. You should see your doctor or dermatologist who will ask for toenail cuttings to test for the type of fungus. You can be given oral medication by your doctor, which you have to take for at least 6 months to be effective but there are possible side effects.
You should start some sort of treatment as these fungal infections can spread to the other nails. From your picture it looks as though you have been lucky so far.
I will send you a message.