Will Retin-A Gel Fade a Natural Skin Tan?

Retin A will Not fade the tan. Retin A makes your skin sensitive to UV light,therefore the sun. Use sunscreens always to protect your skin. You still will get a tan but slower and healthier for your skin

Retin A does sensitize skin to UV light / sunlight.  Depending on the period of non-use, it may be associated with a variable period of flaking and redness. While it will result in dispersal of irregular concentration of skin pigment, Retin A is not a "suntan buster".

You may wish to re-examine the bigger reason why you are on Retin A in the first place though. If you want to have a healthy, thick skin then suntanning is one of the worst things you could do for your skin. It not only ages your skin permanently but cumulatively increases your risk for skin cancers. If you feel that this tan now-regret it later philosophy is the way to go, WHY BOTHER with Retin A in the first place at all?