Why am I getting painful bumps on my scalp and painful dry crusty scabs?

I used a hair color and after using it I noticed I had sores on my scalp that scabed up and when I pulled scab off would rescab and they are painful. It’s been months now and I keep getting these painful bumps that scab over. What should I do? Do I have a infection that needs to be treated with antibiotics? Do to my scratching my scalp?


F, 63, California