Seborrheic keratoses in skin of color
Seborrheic keratoses are the most common benign epithelial lesion in adults. Their dermoscopic features have been well described in the chapter above. The following schematic shows the most typical features.
Schematic of SK
Seborrheic keratoses are found with shades of colors that span light brown to dark brown. They can also have multiple shades of brown and areas of white within a single benign lesion. The darkest SKs can mimic melanoma clinically which makes the understanding of the dermoscopic features so important.
[1][2][3][4][5][6]
There is no data on how SKs in darker skin compare to SKs in lighter skin, but many have observed that dark SKs are common in dark skin.
Examples of darker SKs in persons with skin of color
Large dark cerebriform SK on the face of a Hispanic woman.
Dermoscopy shows ridges and fissures (gyri and sulci)
An SK on the arm of an African American woman.
Dermoscopy shows a cerebral form pattern made up by dark brown keratin ridges.
Large dark brown SK on the back of an African American woman
Dermoscopy shows fat fingers on the periphery caused by keratin ridges. This was biopsied because the fat fingers mimicked streaking/pseudopods.
Small dark SK in a preauricular location of a Hispanic man.
Dermoscopy is consistent with negative network however the biopsy demonstrated this to be an SK.
Sk thigh 85-year-old African American woman – well demarcated border and short keratin ridges
Links to additional chapters on Skin of Color
References
- ↑ Papageorgiou et al.: The limitations of dermoscopy: false-positive and false-negative tumours. J Eur Acad Dermatol Venereol 2018;32:879-888. PMID: 29314288. DOI.
- ↑ Sahin et al.: A comparison of dermoscopic features among lentigo senilis/initial seborrheic keratosis, seborrheic keratosis, lentigo maligna and lentigo maligna melanoma on the face. J Dermatol 2004;31:884-9. PMID: 15729860. DOI.
- ↑ Mansur & Yildiz: A diagnostic challenge: inflamed and pigmented seborrheic keratosis. Clinical, dermoscopic, and histopathological correlation. Dermatol Online J 2019;25:. PMID: 30982311.
- ↑ Salerni et al.: Seborrheic keratosis-like melanoma. J Am Acad Dermatol 2015;72:S53-5. PMID: 25500043. DOI.
- ↑ Braun et al.: Differential Diagnosis of Seborrheic Keratosis: Clinical and Dermoscopic Features. J Drugs Dermatol 2017;16:835-842. PMID: 28915278.
- ↑ Carrera et al.: Dermoscopic Clues for Diagnosing Melanomas That Resemble Seborrheic Keratosis. JAMA Dermatol 2017;153:544-551. PMID: 28355453. DOI.
