About six months ago one of my nails started to curl down. I thought it was from hours of being pressed against the computer mouse. Now all of them are doing it (but not the thumbs). I always had strong long nails. They've had like little ridges on them, lengthways, for as long as I can remember, at least 30 years, so I don't think the curling is related to that. Does anyone know what is causing the curling?
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