Linear scleroderma is a type of localized scleroderma

Morphea

Morphea is a medical term for localized scleroderma. The disease involves isolated patches of hardened skin - there generally is no internal organ involvement.-Background, nomenclature, classification & codification :...

which is an auto-immune disorder characterized by a line of thickened skin which can affect the bones and muscles underneath it.

Presentation

It most often occurs in the arms, legs, or forehead, and may occur in more than one area.

It is also most likely to be on just one side of the body.

Linear scleroderma generally first appears in young children.