In previous ISSVA classifications this term has been attached to both a specific diagnosis of an isolated red cutaneous stain, usually caused by a somatic pathogenic variant in the gene GNAQ, and to a general category of congenital cutaneous vascular malformations characterized by small vessels on pathology. In the current classification the specific lesion has been renamed as ‘port wine capillary malformation’; the term ‘capillary malformation’ is now a subcategory of slow-flow malformations, and may sometimes be applied non-specifically in the process of seeking a specific diagnosis.