Some slight bleeding with a skin graft is normal and nothing to worry about.
When I had a skin graft done a few years ago the doctor said that it was normal to expect some slight bleeding with the skin graft.
The doctor said that I should expect some slight bleeding, swelling, bruising, redness, and discomfort for awhile after the skin graft.
If the skin graft bleeding gets worse then you should go to the emergency room or urgent care or a walk in clinic.
If the bleeding with the skin graft is more severe go to the emergency room.
But if it's just lightly bleeding then it's normal and nothing to worry about.