In about two-thirds of people with nail melanoma, the main symptom is longitudinal melanonychia, a dark vertical streak or line under the nail plate. It may be thin or thick, and light brown to black.

Michelle Tagliamonte, 58, was getting a manicure when she noticed the black lines on her thumb, which signaled the start of a fast-spreading cancer.

For Black people, surviving skin cancer begins with knowing what to look for—and where. Hint: It often shows up where the sun ...

Subungual melanoma, or nail melanoma, is skin cancer under your nail. It usually appears as a dark, vertical streak on your nail. Subungual melanoma is rare but serious. Unlike other skin cancers ...

For example: Nail trauma often causes pain and swelling. Medications may lead to side effects like gastrointestinal issues and headaches. Melanoma can present with a bump under the nail and other ...