Horizontal cracks in my toenail, no other foot problems

Patient

Q: What are the cracks in my toenails? I have 2 horizontal cracks in each of my toenail, one is at the top and almost grown out, the other has just appeared at the bottom
EDIT:
Pictures added - dark lines are nail varnish residue within the cracks.. There are 2 cracks on each big toenail 1 at the top, 1 a few millimetres from the bottom. Side on picture shows toenail raised.

Symptoms:  Horizontal cracks along toenails - no other foot problems
Doctor

A:   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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