In the past 6-8 months, I have developed a channel or groove in my right index nail, running the entire length of the nail from the cuticle bed to the tip. No other nails are impacted on either hand. I can't find anything online about "why" this might occur. I suspect it is diet-related, but I'm at a loss as to what to add/delete from the diet. Nothing major has changed diet-wise in many years; my waistline attests to this!!
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Salt Lake City, UT