I have a two part problem I have a severe case of dandruff, but I also have oily
hair and I get these "bumps" that from what I can find are a type of Sebaceous cyst. (They look and feel just like a pimple on my scalp and come to a head just like a pimple.) I have battled the "bumps" for more than 6-7 years now and have never found anything that works to keep them away.
I have used T-gel of various strengths, tea tree shampoos, shampooing twice, shampoo and conditioner, etc.