Viral Photo Sparks Cancer Concern After Man Shares Dark Line on Finger

Could It Be a Sign of Subungual Melanoma?

One of the main concerns raised was that the line could be a symptom of subungual melanoma, a rare but dangerous form of skin cancer that develops under the nail.

According to the Cleveland Clinic, subungual melanoma typically appears as a dark, vertical stripe and is often mistaken for a bruise or benign streak. However, when the line becomes wider, darker, or changes over time, it’s crucial to get it checked by a dermatologist.

As noted by DermNet, melanonychia refers to a brown or black pigmentation of the nail. It can be harmless—or it can signal something more serious.

Other possible causes of nail discoloration include:

• Splinter hemorrhages (tiny blood clots under the nail)

• Beau’s lines (horizontal ridges indicating past illness)

• Fungal infections

• Vitamin or nutrient deficiencies

But medical professionals stress: If the pigmentation darkens, spreads, or appears suddenly, it must be evaluated.

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