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Seborrheic keratoses are benign papules and plaques, beige to brown or even black, 3–20 mm in diameter, with a velvety or warty surface (eFigure 6–6). They appear to be stuck or pasted onto the skin (Figure 6–4). They are extremely common—especially in older adults—and may be mistaken for melanomas or other types of cutaneous neoplasms. No treatment is needed. They may be frozen with liquid nitrogen or curetted if itchy or inflamed but usually recur after treatment.

eFigure 6–6.

A: Seborrheic keratosis with verrucous appearance on the forehead. B: Seborrheic keratosis with irregular borders and variation in color that might suggest a possible melanoma using the ABCDE criteria. Dermoscopically it was completely benign and a biopsy was not needed. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley HS. The Color Atlas and Synopsis of Family Medicine, 3rd ed. McGraw-Hill, 2019.)

Figure 6–4.

Seborrheic keratosis with light pigmentation, with waxy, dry, “stuck-on,” appearance. (Reproduced with permission from Richard P. Usatine, MD, in Usatine RP, Smith MA, Mayeaux EJ Jr, Chumley H. The Color Atlas of Family Medicine, 2nd ed. McGraw-Hill, 2013.)

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Hruza  GJ  et al. Safety and efficacy of nanosecond pulsed electric field treatment of seborrheic keratoses. Dermatol Surg. 2020;46:1183.
[PubMed: 31809349]  
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Wollina  U. Recent advances in managing and understanding seborrheic keratosis. F1000Res. 2019;8:F1000 Faculty Rev-1520.
[PubMed: 31508199]  

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