I have ezcema on my scalp and I do this. However, I'm diagnosed not only with OCD but also Bipolar. I also pull my hair out. I seem to only do this where there is severe damage to my scalp when I'm manic. I can't stop when I'm like this. So I'm not sure what illness is doing this, or its both. I don't know about dandruff but I use a recipe on line using apple cider vinegar. I don't do it when it is open sores, stings bad. It's not a cure all for me but helps.