2 months post op, might scratch my head in my sleep. Blood stains on pillow and crusts from wounds have appeared. Advice?

It is best to ask your surgeon about post operative care as each doctor has their unique regimen.  Having blood stains after 2 months is not normal.

small pimples may cause that kind of itching... I suggest you to hot water compress on to pimples  by using a small hot wet towel for 2-3 minutes and 2 times  a day for 1 week.İt surprisingly decrease the inflammation and infection.Dont forget that you may wash your head with normal pressure and if you need you can use a wet towel with soap for massage the scabby area, it Works very well to remove scabs and dirt that may cause itching also .

If you can't stop scratching your head 2 months after transplant, wear mittens or gloves when you sleep