Nail fungus type infection , only on each big toe ?

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Hi all , so my daughter is turning 18 soon and she has this nail fungus going on , it has been treated before , but it hangs around it seems. The foot doctor now prescribed 2 creams along with using some tea tree oil to soften the nail. This is prescribed for six month's , otherwise he says he could remove the nails , or there is some really strong stuff they can try , but it's really hard on the liver they say. The odd thing is that it is only on each big toe at this time, i mean is there a reason it would be only on just the big toe on each foot ? I could understand it spreading to nearby nails , but how does it jump across from big toe to big toe only? In other words , what is it about the big toes , that's different from the others? Could this be a clue of how this started or where it came from? Could it be genetic? thanks for any help