However, the American Academy of Dermatology (AADA) points out that, although rare, skin cancer can also form under or around the fingernails and toenails. This type of cancer, known as subungual melanoma or nail melanoma, is not caused by sun exposure.
Subungual melanoma often develops on the big toe, thumb, or index finger and is classified as a serious condition by the Cleveland Clinic.
Although anyone can develop subungual melanoma, the risk is higher in people between the ages of 50 and 70.
It is also more common among people of African American, Asian, or Latino descent.
Dark streaks on nails could be a sign of melanoma
What are the signs of nail melanoma?
There are several warning signs that may indicate the presence of nail melanoma. Dermatologists consulted by the AADA have identified five main indicators to watch for:
A dark, black, or brown stripe appearing on the nail. It is most often seen on the big toe of the dominant hand or foot, but can develop on any nail.
Darkening of the skin around or next to the nail.
Peeling of the nail from the finger or toe, separation from the nail bed.
Splitting of the nail in the middle.
The appearance of a lump or nodule on the nail, which may be accompanied by a colored band. This band may be wide and uneven or narrow and dark.
