Clinical and dermoscopic features were consistent with a sporadic angiokeratoma, a benign ectasia of vessels associated with keratinization. Diagnosis was confirmed with shave biopsy.
Sporadic angiokeratomas are common and increase with age. They may occur anywhere on the skin, including mucous membranes. Dermoscopy of an angiokeratoma will reveal vascular lacunae—small pools of red or near black blood—as well as keratin scale, which appears as a white veil or shiny white lines.1
Other subtypes of angiokeratomas may be more widespread, including angiokeratoma of Fordyce, which manifests on the vulva and scrotum (usually in adulthood), or angiokeratoma circumscriptum, which occurs congenitally. There are some rare syndromic conditions associated with widespread angiokeratomas, such as Fabry disease.
The differential diagnosis for this solitary, vascular-appearing papule or plaque includes cherry angioma, pyogenic granuloma, and melanoma. Over time, the keratinization may increase, and lesions may look like a wart. A punch or shave biopsy will distinguish an angiokeratoma from other types of lesions. When a lesion is small enough, it may also be curative.
Angiokeratomas do not require treatment. However, because they may occur in cosmetically sensitive areas or bleed when traumatized, remedies are often sought. Excision, cryotherapy, electrocautery, and vascular laser are all possible treatments.
In this case, the patient was treated with curettage and light electrocautery, which left a small scar.
Text courtesy of Jonathan Karnes, MD, medical director, MDFMR Dermatology Services, Augusta, ME. Photos courtesy of Jonathan Karnes, MD (copyright retained).