Picture of Transient Neonatal Pustular Melanosis
Transient neonatal pustular melanosis (TNPM), also called pustular melanosis, is a harmless skin condition that appears in newborns of African American descent. These blisters can be anywhere on the body and can easily rupture, leaving dark spots on the skin. The blisters themselves resolve on their own in a few days but the spots can take days or weeks to fade.
Text Source: American Osteopathic College of Dermatology
National Library of Medicine