Hello. I know this is an old post, but I hope you find my response helpful. I, too, am sensitive to any type of shampoo, and I thank God that has He has given me a solution. I do apple cider vinegar rinses.
I put a small amount (about 2 tablespoons) of apple cider vinegar into an 8oz spray bottle. I fill the rest with water, and I spray my hair until it is saturated. Then, I massage my scalp as if I am shampooing. Once I rinse, I'll check to see it there's any buildup left. Sometimes, I will repeat the process but not massage as long.
Hello,
From your symptoms the rash can be due to contact dermatitis but for the bumps, folliculitis and perifolliculitis needs to be ruled out. It is characterized by small, very itchy pustules within the scalp, often most troublesome on the frontal hairline. The scalp should be washed with a mild normal shampoo as often as desired. Antidandruff shampoos containing antifungal agents such as ketoconazole or ciclopirox are sometimes helpful. Apart from that you need topical and oral antibiotics, antihistamines, oral steroids and topical tretinoin.
My sincere advice is to get it examined from a dermatologist. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Also, I also stopped using any type of detergent/body wash/ soap/etc. on the rest of my body (except my hands) unless absolutely necessary because it made my skin frequently break out in rashes. Unfortunately, I don't have this option with my hair.