SNP‐based chromosomal microarray will detect whole genome homozygosity associated with a molar pregnancy as will microsatellite genotyping (Fisher et al., 2014; Furtado et al., 2013), however, when a complete mole is suspected on the basis of morphology, it should be evaluated for p57KIP2 immunostaining. The gene discussed is CDKN1C; the disease is melanocytic nevus.