If you keep noticing white marks on your finger and toenails, it could be a fungal infection, a nutritional deficieny, or something more serious.
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White spots on nails from bartending? Does anyone else get this? Can this be related to bartending at all? : r/bartenders
white spots nails Nail health signs, Nail health, White spots on nails
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White nail - Leukonychia: An overview — DermNet