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Can a fungal infection on a fingernail go away by itself?

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I've had one on my index fiŋger for over a year, it's not a very severe one but it simply won't go away. I've gone to my doctors, he gave me penlac, it's an anti-biotic nail polish. But I've b een using it for over half a year and it won't go away still. I've also tried the vinegar treatment which has done nothing as well.

Also, I wanted to paint my nails. Would using nail polish make it worst?