Seborrheic keratosis
Below are dermoscopic features commonly associated with the diagnosis “Seborrheic keratosis”.[1] The example images have been approved by a panel of experts as representative of each given feature.
For a more in-depth discussion of associated features, please see the Dermoscopedia page for “Seborrheic keratosis”.
Milia-like cysts
White-to-yellow, round structures that appear very bright when contrasted with their dark brown or black surroundings. Easier to visualize with non-polarized dermoscopy than with polarized dermoscopy.[1]
Comedo-like openings
Round to ovoid craters that have black or brown comedo like plugs.[2]
Moth-eaten (sharply demarcated) borders
Presence of a sharply demarcated and irregularly curved border; portions of the border are often scalloped, giving a moth-eaten appearance.[3]
“Fissures and ridges” / gyri and sulci / cerebriform pattern
Fissures (sulci) are linear comedo-like openings; they appear dark brown to black. Multiple fissures (sulci) and ridges (gyri) may produce a cerebriform pattern, where the structures resemble sulci and gyri of the brain.[4]
Fat-fingers
Linear and wide dermoscopic structures corresponding to ridges. Often short and sausage-shaped.[5]
Fingerprint-like structures
Fine parallel running lines of light brown to dark brown colors that resemble the dermatoglyphics of a human fingerprint.[6]
Hairpin (looped) vessels, usually with whitish halo
Hairpin vessels can appear as perfect “U”-shaped vessels, or can appear as “U”-shaped vessels that are twisted upon themselves.[7]
- ↑ Fried LJ, Tan A, Berry EG, et al. Dermoscopy Proficiency Expectations for US Dermatology Resident Physicians: Results of a Modified Delphi Survey of Pigmented Lesion Experts. JAMA Dermatol. Published online January 06, 2021. doi:10.1001/jamadermatol.2020.5213
