I have this too and it's so annoying. I am going to try that tea tree oil treatment to see if it helps.
3b | low-normal porosity (still confused, definitely not high porosity) | med to coarse texture

Co-Wash: most any silicone free V05 or Suave | RO: GVP Cond. Balm, GVP Joico K Pak, Tresemme Naturals Moisutrizing Cond., SheaMoisture Shea Butter Restorative Cond. | LI: one of my rinse outs | DT: one of my rinse outs with oil | Stylers: BRHG