Infection/allergy? This is a very unusual symptom, in fact i don't think i've ever had a patient with this problem! i did some research- the most likely cause is a fungal infection under the nail, a common problem that is usually not itchy, but the nail should look thick, distorted or discolored. It might also be a reaction to nail polish. It might also be an allergy to something you are eating. See my comment:.

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