I have seen two individual chiropodists to have my nails 'tidied' at different times.
One said the discolouration on one of my bog toes was a fungal infection, and prescribed Curanail.
The other said the discolouration was due to my psoraiasis, which made it appear to be a fungal infection, but was not, and would not respond to treatment.
So - there you have it - or not!