It’s commonly misconstrued as extremely bad dandruff but they are two separate issues. Anywho, I got perscribed the world. Even had some oils with steroids make my scalp sore and I had to wash my hair. I thought cleansing more often would help because it was due to build up, but eventually it only made matters worse. So I did a crap ton of research and heard about MCT oil. It’s a dirivitive of coconut oil, but it lacks an ingredient that feeds the yeast that causes this problem. I saw it on Reddit so I took it with a grain of salt, but I was desperate and would have put sheep’s blood on my scalp at this point. So I clarified my hair and scalp a month ago and used it for the first time. My scalp was BAD. It was white and it looked like my shoulders had snow on them. I oiled my scalp with it after blow drying my hair and the next day it was completely cleared up. I was dumbfounded. My scalp was a normal skin color with no flakes in sight. The day after my scalp got a little itchy so I used some more. I wound up using it every other day for the first two weeks. That second week I switched to tgel shampoo to help things along. The third week I only needed it right after wash day and I didn’t wash my hair for 2 weeks and there was no dandruff or flakes at all. Now I’m on my 4th week and I’ve been sick as heck with the flu. I managed to shower and wash my hair. Then I passed out. I haven’t oiled my scalp or even put product in my hair *gasps judgmentally* and my scalp is doing great! Just thought I’d pass this along. I haven't, since this issue has started, been able to go more than 5 days before my scalp was a itchy hot mess. I would deal with the itchiness for 2 days since I didn’t want to wash my hair that often. I was tired of having to choose between the health of my scalp or the health of my hair but never getting both. This way I get both!!