Piebaldism:born with a blonde (not white/gray) hair patch in the front of my head. now lost color to a patch of forehead skin. can it spread this way?

Mutations of either : the KIT gene on Chr. 4q12 or the SNA12 gene on Chr. 8q11,inherited in an Autosomal Dominant fashion, cause Piebaldism. I found 1 case report of ^ing hypopigmented skin patches, thought to be from instability of melanocytes, pigment-producing cells, caused by the specific mutation. Your dermatologist can check for more spots with & without a Woods lamp. See ghr.nlm.nih.gov/condition/piebaldism.