Aplasia cutis congenita SNOMEDCT_US:35484002 Absence of part of skin at birth UMLS:C0282160 SNOMEDCT_US:74223008 Congenital scars A developmental defect resulting in the congenital absence of skin in multiple or solitary non-inflammatory, well-demarcated, oval or circular ulcers with a diameter of about 1 to 2 cm. Aplasia cutis congenita most commonly occurs on the scalp, but may present in the face, trunk, or limbs. SNOMEDCT_US:254237003 UMLS:C0265989 Congenital absence of skin HP:0001057 Cutis aplasia MEDDRA:10002963 Aplasia/Hypoplasia of the skin