Whitening of the nails is referred to as leukonychia. The whitening may be present as dots or lines. It has vast etiology ranging from minimal injury to nail bed to organ failure. The causes of leukonychia are: - Injury to nail bed - Allergic reaction to nail polish or acrylic nails - Superficial onychomycosis - Zinc deficiency - Calcium deficiency Other harmful causes of leukonychia are: - Arsenic poisoning - Pneumonia - Heart disease - Renal failure - Psoriasis - Eczema Reference: https://www.healthline.com/health/white-spots-on-nails#symptoms Image via: https://www.news-medical.net/health/Types-of-Leukonychia.aspx