DermNet provides Google Translate, a free machine translation service. Note that this may not provide an exact translation in all languages
Author: Vanessa Ngan, Staff Writer, 2003.
An angiokeratoma is a small red to purple papule. It may have a rough scaly surface. It is composed of surface blood vessels (dilated capillaries). Often unnoticed, an angiokeratoma may become crusty and bleed if accidentally scratched or damaged, or a harmless clot may form in the lesion (thrombosis), changing the colour to dark purple or black overnight.
There are several types of angiokeratomas:
Apart from Fabry disease, which is caused by a genetic defect, the cause of other angiokeratomas is unknown.
See also, angiokeratoma pathology.
Angiokeratomas are harmless surface vascular lesions that can usually be left alone. As the black spots sometimes resemble melanoma, a skin biopsy may be performed to rule out malignancy and allay any fears.
See the DermNet NZ bookstore.
© 2019 DermNet New Zealand Trust.
DermNet NZ does not provide an online consultation service. If you have any concerns with your skin or its treatment, see a dermatologist for advice.