I had a crash in Feb but don't remember this particular problem. My wounds were washed and stitched up before my concussive amnesia wore off though but the road rash burned like hell for awhile. They were keeping it moist with antibiotic ointment and they put a maxi pad on with tape over it as it doesn't pull at the wound like a band aid. Kind of weird, but I guess it worked.

Keep it moist. Keep antibiotic ointment on it.

Also sadly sometimes the chemicals in the road cause the skin to hyperpigment which will cause some color to your scar. This happened to my leg but not really to my face. Put a lot of sunscreen on it when it heals to avoid hyperpigmentation, however it may be unavoidable.

Wish you luck.

Did you say you hurt your shoulder. I did too. Broke my scapula really still a pain but I'm starting formal therapy next week.