Shaving over scars....

Morning Gents,
i have a weird one today, i have a bit of keloid scarring under my nose; pretty much directly under my right nostril, where a tooth burst through my lip many years ago.
not massively noticable or pronounced nowadays but it was where i ALWAYS nicked with my old razor.

Basically i am still a newbie to this game, but have graduated to most of my face with the straight (good results so far and not too many cuts.....yet) Just need a bit of advice on how to do under the nose with obstruction. should it make any difference? I have watched videos on this area of shaving and the steep cutting angle is scaring me a little.....
any advice would be awesome.

See here. http://straightrazorpalace.com/shavi...ey-scar-s.html