I have super sensitive skin and get dermatitis flares on my scalp easily. I would like to suggest looking at your diet too. I'm allergic to bakers yeast and finally found out that that was causing my dermatitis flares on my scalp! I know it's weird, but I'm so relieved to have figured it out. I know there are other causes for me too but I never realized my diet would cause a scalp issue. O.o
Anyways, as far as products go, I use Kathy's family prairie therapy shampoo (for low poo) and conditioner. The AWESOME thing is this: if you are allergic to an ingredient, they will make a special batch without it, just for you! I also discovered that when you message them on their website, someone called me and offered a promo price. The website has the ingredients listed so you can take a look.