It's called boraras naevus and is just 2cm long!

N�vus, nē′vus, n. a birth-mark: a congenital growth strictly on a part of the skin, whether a pigmentary n�vus or mole, or a vascular naevus or overgrowth of capillary blood-vessels—also Mother-spot or Birth-mark—also N�ve, Neve:—pl.

The case–control analysis corrected for naevus count and eye colour was computed by fitting a logistic regression with naevus count and eye colour categories as covariates.

The variant allele was also associated with increased naevus count and non-blue eye colour.

Sometimes the hairy anomalies are but instances of naevus pilosus.