one or more patches of skin become bluish/brown and sharply depressed below the level of the entirely normal surrounding skin (i.e. non surrounding erythema)
•
the back is almost always involved
•
sharp “cliff drop” border at interface with normal skin
•
ddx: vs. morphea (academic) – ivory white indurated plaque with an edematous lilac ring characteristic
Todd's thoughts:
•
this disease seems to exist somewhere on the spectrum between atrophy and sclerosis (in other words it exists between LS et A and morphea)