You may remember that I have the skin issues when trying to grow out my hair. I have tried shampoo with salicylic acid in it, and it didn't work. A dermatologist gave me 2 prescriptions, a shampoo and a lotion to apply twice a day. Neither worked. If I shave daily, no problems. I accept this as a sign I'm destined to forever sport a shaved bald head. When someone has a hard time understanding why I am BBC, I use the dermatitis as an excuse. Easier than telling them I love having a shaved head!
I also tried every home remedy I read about, vinegar, peroxide, etc. I did just read that cleansing with Dawn dishsoap might work, haven't wanted to stop shaving, so haven't tried it. Good luck, hope you can find a solution.