To diagnose BXO or LSA: "The glans demonstrated sclerogenous ivory colored patches located perimeatally, which is the classic manifestation that determines diagnosis." (Meuli)

LSA can often be caused by the abrasive effect of a primary phimotic ring against the coronal ridge of the glans and/or often result in the development of a secondary phimotic ring.

The lichenoid form of ring is difficult or impossible to stretch. Please read the basic 3 sentances of information in the abstract from Treatment of Phimosis before continuing here.

a collection of letters - inc. success with homeopathy
medical studies possible cure with Clobetasol Propionate
And other sites
The Lichen Schlerosus Support Group
Dr. K.W. Chow has a very informative medical description.