Hard scalp sticky dandruff after FUE. 3 weeks post-op.

I had my procedure of 3000 grafts on 10 September and my recovery is very good. But after my first PRP session i got a layer of blood on my head and it accumulated and merged with dandruff, it is not coming out unless i scratch it. I tried Nizoral twice a week but no luck as of now, can i used lemon + coconut oil, tea tree oil etc. natural method for the dandruff now ? Or can you suggest me something ? I had this kind of sticky dandruff before the procedure too.