I developed seborrheic dermatitis after using perfumed shampoo. Even though I washed my hair thoroughly, I had a lot of dandruff and it was incredibly itchy. I searched for a shampoo good for seborrheic dermatitis and found enlightenment after using Head & Shoulders Cool Menthol Shampoo. Since it is a cooling shampoo, my scalp feels refreshing when washing, and the dandruff has decreased. If you have seborrheic dermatitis, you should try this. I will never use perfumed shampoo again.