I get sores like that too on my scalp sometimes. I also can't just cowash or else I end up getting sores, no matter what conditioner I use. Anyway, I also recommend the Giovanni TTTT shampoo! It has really helped and is quite gentle. You also might want to look into getting some straight tea tree oil. I either apply it straight to the sores or mix it with some jojoba oil and massage my scalp with it, which does seem to help!
Somewhere between a 2b/c and a 3a

Current product favorites
Cleansers: Giovanni TTTT shampoo, Deva No-Poo, Tresemme Naturals Moisturizing Conditioner
Conditioners: Tigi Moisture Maniac, Yes to Cucumbers, GVP Conditioning Balm, AOHR
Stylers/Gels: KCCC, SS CEJ and FHG, AOMM, BRHG, LA Looks Sport Gel, Lustrasilk (winter), Pink Boots (winter)
Henna glosses!