Ridges in Fingernails: Causes and Treatments - Verywell Health
https://www.verywellhealth.com/ridges-in-fingernails-7254272
WEBMay 26, 2023 · Nail ridges are small, raised lines on the nail that can run vertically or horizontally. Vertical nail ridges are typically harmless. Horizontal nail ridges (Beau's lines) are more likely to be associated with a medical condition. Nail ridges can be caused by aging, injury, infection, illness, or medical condition.
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