scalp Scabs?

[GaphicDesigner]

so for a month now, I have had two scabs on my scalp in front area of the hair near forehead,I am girl.One went away and then the skin was pink but came back it like dark brown colored and they bleed.I put witch hazel on them. I use a sulfate free shampoo and sometimes a tea tree oil shampoo. I have pictures but not sure where to upload them. Is it something,I should be worried about or would they take longer than month to go away. I tried looking online for answers but I see different possible things like allergic to shampoo to worse skin cancer. I have no symptoms any where else on my body or feel bad in any way.Its just these bumps aren't getting better. They first appeared beginning of last month. Thanks for any help.
below are my photobucket of the pictures of the scalp scabs.
http://s1259.photobucket.com/user/graphicdesigner22/library/scabs%20for%20medical%20pictures