Discussion
Progressive Hemifacial atrophy and segmental vitiligo are two distinct disease entities which lies within the autoimmune spectrum of disease. The cases of co-occurrence of Progressive hemifacial atrophy and homolateral segmental vitiligo are characterized by an onset at younger age, rapid progression followed by stabilization, and dermatomal distribution.3,4,5,6,7,8,9,10 Segmental Vitiligo is an acquired idiopathic condition of localized depigmentation in a unilateral dermatomal distribution that result from progressive loss of functional melanocytes.2 The pathogenesis of the segmental vitiligo is unclear and various hypothesis have been put forward including sympathetic nerve dysfunction and immune patho-mechanism. Different causative factors have been postulated in morphea such as immunological abnormalities, trauma neurological abnormalities and infectious diseases.3,11 There was no significant family history, history of trauma or infections preceding the onset of skin lesion and no any other significant clinical physical findings suggestive of other possible causes for Progressive Hemifacial Atrophy and Segmental Vitiligo.