I think oral tretament is going too far.
I've had excellent success (had it once, never came back) with a topical antifungal called Loceryl (active principle Amorolfin) here in Switzerland. It's in the form of a nail polish, and comes as a pack with dedicated antiseptic wipes and emery boards.
You file off as much as you can of the affected nail (do this in a place that you can clean, such as the bathtub, then flush the debris down), toss the emery board, then wipe (including fingers), then apply the polish (every 2-3 days) and rinse and repeat (the filing, you do less often, maybe every 2-3 weeks) until the lesion has grown out.
Tea tree oil has anti-bacterial properties, possibly antifungal I guess, but likely not strong enough to get rid of those nasty buggers.



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