Mole or Melanoma? Visual Signs Ai Diagnostic Apps Miss Across Diverse Skin Tones

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Standard public health campaigns instruct patients to watch for the conventional ABCDE criteria: Asymmetry, Border irregularity, Color variation, Diameter greater than six millimeters, and Evolving shape. While valuable for superficial spreading melanoma on sun-exposed shoulders or forearms, this framework poorly reflects how deadly skin cancers present across diverse populations.

Patients with brown and black skin contract cutaneous malignancies far less frequently than fair-skinned individuals, but they face significantly higher mortality rates upon diagnosis. The five-year survival rate for Black patients diagnosed with melanoma stands at roughly 70%, compared to more than 90% for white patients, according to American Cancer Society registries. This survival gap stems almost entirely from delayed discovery.

In deeply pigmented skin, melanomas appear disproportionately on non-sun-exposed surfaces. Acral lentiginous melanoma (ALM), the subtype that caused the death of reggae icon Bob Marley at age thirty-six, develops on the palms of the hands, the soles of the feet, and beneath the nail beds. Mobile diagnostic tools looking for jagged sunspots routinely fail to recognize ALM in its early, treatable radial growth phase.