The article offers information on a study related to associations between novel mutations in SASH1 with dyschromatosis universalis hereditaria . Topics discussed include a case of a 25‑year‑old woman born with normal skin pigmentation, and at the age of 3 years, freckle‑like macules appeared initially on her trunk, and then gradually extended to involve her face; and a case of a 42‑year‑old man who experienced a similar clinical process to that of the proband 1.