Ask the doctor: Seborrheic keratoses
People sometimes mistake seborrheic keratosis for melanoma, the most serious type of skin cancer, because in both, the growths are dark and have an irregular shape. Smaller, heavily pigmented seborrheic keratoses can, in fact, look a little like melanoma lesions. A dermatologist can usually tell the difference just by looking at them. If there's any doubt, he or she should get a biopsy (a tiny sample from the lesion) for microscopic examination.
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