Welcome to Sclero Forums. Yes I see you joined us in 2006. My how the time flies! I'm glad your scleroderma has been pretty stable. It's such an odd illness, isn't it, where it can sometimes plod along for years without much change, and then suddenly there can be a monkey wrench thrown into the whole works.
Since the patches are on your knee, if it is morphea it could possibly go deeper and affect the range of motion in your leg -- and because there are treatments for morphea now, particularly UVA1 phototherapy -- and because treatments are best at preventing damage than fixing stuff that has already occurred -- I'd recommend that you see your rheumatologist earlier, if possible.
One consideration is that they might not be over pleased to think that you just allowed something to worsen, for over six months, while on their watch. So think of this as a way to keep them happy, and to be on the safe side of things too, since it could be just hyperpigmentation, but it could also be morphea, or who knows what else.
You know that we don't know how your insurance works, what your co-pay is, how bad it is, etc. ad infinitum, so as always, this is your call, and just my two cents' worth. Oh wait, I just looked on the ledgers, and you haven't paid your two cents' dues for the year! Sorry, make that my FREE advice, which is probably about exactly what its worth. :emoticon-dont-know: