Merck Manual

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Mees Lines (Leukonychia Striata)
Mees Lines (Leukonychia Striata)

This photo shows white lines that run across the width of the fingernail (indicated by arrows). These lines are called Mees lines. Mees lines may be caused by more serious health problems, including cancer or heart failure, chemotherapy, or exposure to certain toxins, such as arsenic, thallium, or other heavy metals.