Melanonychia is a condition in which the nails turn black or brown. It can occur in people of all ages, including children, and it doesn't matter whether you are a boy or a girl. It is more common in people with dark skin, especially those classified as Fitzpatrick skin types V or VI. Nearly all people of African or Caribbean descent develop melanonychia in their nails by the age of 50. Approximately 20% of people from Japan also experience melanonychia. It is less common in people with fair skin. Melanonychia can also be caused by genetics, injuries, certain medications, nutrient deficiencies, hormonal issues, diseases affecting the skin or connective tissue, inflammatory skin conditions, growths on the nail, or a nail infection.
"Our Goal: Discovering 0.1% of nail cancer cases among 23,500,000,000 children's fingers every year. Free of charge."