Is the heredity of reticulate acro pigmentation of Kitamura always autosomal dominant?

Reticulate acropigmentation of Kitamura (RAK) in three patients and their families is described. In one family, 2 women and 2 men were affected out of 9 individuals. In the other family, 6 women had lesions of reticulate acropigmentation out of total of 27 over three generations. In the third family, one man was affected. All of the cases had palmar pits; onset of lesions was after puberty in all the cases. The apparently different hereditary patterns in these three families are striking, and autosomal dominant inheritance appears unlikely in every case.