After doing some research, I believe it is an over production and
build up of sebum on
the scalp. I have had acne problems, have rosacea, and
my skin and
hair is very oily
. I found balancing shampoos on
line that are supposed to prevent sebum build up. Aveda is on
e of them, but I haven't tried it.
Sebum: substance with an oily con
sistency produced by the sebaceous gland
s. It lubricates hair, is an antifungal/antibacterial, and
imparts waterproofing properties to the skin.