Hereditary bullous dystrophy of the macular type (HBDM) is a rare X-linked recessive disorder characterized by the formation of bullae without evident trauma, hyper- and hypopigmentation, absence of hair at birth, and, in some cases, microcephaly, mildly impaired intellectual development, short conic fingers, and aberrations of nails (summary by Wijker et al., 1995). [from
OMIM]