What are the chances of being born with a birthmark?
A port-wine stain (PWS) is a congenital progressive ectasia of the superficial cutaneous vascular plexus that is present in 0.3% to 0.5% of children at birth. It first appears as a pale pink macule that evolves with time and becomes dark red to purple. Nodularities and a cobblestone pattern may develop, and severe hypertrophy with facial asymmetry or deformity sometimes occurs.
