What Causes Greasy Hair On Scalp?

Hi, This may sound trivial but it does have a huge impact on my self confidence. I have extremely greasy hair that needs washing eveyday. I had acne from 13 to 26 and have had roaccutane treatment 9 yrs ago. I was wondering if there was a hormone test that I can take to check if I have a hormone deficiency. Any advice would be greatly appreciated. Age 35, 5'2'' and 13 stone weight.