Face is soooo oily!!!!!?

okay. i need help! im a 16 year old girl, and my face gets sooo oily, like ill be sitting down, and my face looks like im sweating!! i have been on acne medication prescribed by my derm for about a yr (tazorac&duac, both topical prescriptions, not pills) and i use mary kay velocity cleanser,blemish control toner,and velocity moisturizer. i dont know why my face is so oily but its gross! is it mary kay products thats causing this or the acne meds? help!