I hit my head 4 days after transplant and blood came out. Is it going to damage my grafts? (Photo)

Based on your photo it does not appear that there has been much damage to the grafts.The worst case scenario would be that you lost just a few grafts-in the overall results this should have no effect and you should expect a nice result.

If there was significant trauma, you may have damaged your grafts.  There is no way to tell with a photo.  If you are concerned it is best to follow up with your doctor.

Its certainly possible you could have damaged the grafts or dislodges a few of them to cause a slight bleed. The best thing to do is contact your Surgeon and go and see them to assess the damage as they can see you face to face which is far better in this instance. Its doesn't appear too bad from the photos and only a few recipient sites that have oozed slightly so don't worry too much, but DO consult your surgeon and have them have a look please.