I had a deep tumor, and needed a skin graft on my nose. It is now 18 days after, and the graft is dark, like a scab. The dressing was stitched on and removed after 7 days, and I did not keep a band aid on it beginning two days after that. I put Vaseline on the graft about twice a day. Th skin around the graft is dark pink. Is this the normal healing pattern?