Did the solution of dye hurt scalp?

Hi, i had my hair dyed 2 months ago i had to let grow out ( due to money). every since letting it grow, my scalp got 2 small sores on it and washing does not hurt, brushing does sometimes but now i have a couple more. and they itch and when the sores are open it bleeds, when it bleeds i can see blood on my fingers when i rub hands through hair, also scabs come off by self when brushing. not so bad bleed, only bleeds when i scratch You can see some sores in mirror. i am concerned i never had this before. I have dyed my hair once before, with this time my scalp burned and itched a lot. They said i have a very sensitive scalp. but before when i had it dyed at different place it itched but never burned like that. I am wondering it was the solution from the hair dresser, i do want it redyed but a friend ( she is hair dresser not one that dyed first time)she said she can not dye with sores on head. she has no clue what is happening. Does anyone have any clue. I did not change shampoo, or anything like that. any suggestions are welcome ty..