Hello, I suffer from mild cystic acne so my doctor prescribed me Tretinoin (Retin-A) Creme,*Doxycycline 100mg, and Benzol Peroxide. For a cleanser she gave me Cetaphil. I know I needed a moisturizer so I went out and bought my own Cetaphil Moisturizing Creme myself. So I go to pick up my...