? Leukonychia ?: Milk spots on nails are usually harmless & related to nail trauma (such as biting nails). Other causes can be Iron or protein deficiency, lead or arsenic poisoning, renal failure, cirrhosis, pneumonia, heart disease, psoriasis or marked psychological stress. Zinc or calcium deficiency are possible if on both finger & toe nails.
Answered 1/27/2021
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