My hair is due to be relaxed but i have a few scabs from the previous time. Can i still relax it?

DO NOT RELAX YOUR HAIR WHEN YOUR SCALP IS HEALING!!!!! Let it heal first. Those scabs are from the relaxer burning your scalp. Anyway, what type of strength are you using? It sounds like that relaxer is too strong for your scalp. There are some women who have sensitive scalps and they have to use kiddie perms. You really should speak to your hair dresser or another cosmetologist about it. Have a professional put it in next time.