While each product featured is independently selected by our editors, we may include paid promotion. If you buy something through our links, we may earn commission. Read more about our Product Review Guidelines here. I’ve had scalp psoriasis for a few years now and I’m happy to say I have it mostly under control. I use a prescription shampoo from the dermatologist a few times a month and an over-the-counter (OTC) one for seborrheic dermatitis the rest of the time. My favorite is Philip B. Anti-Flake Relief Shampoo ($60). This keeps any flakes or red rashes at bay. But recently, I was worried when I saw those same scaly patches…