Differin side effects

My dermatologist has recently put me on differin .1 gel while I have been on Benzaclyin for the last 3 months.  My acne is under control now and the differin is to help "maintain" my skin.  I have not even been on differin for a week yet, but doing some reading I have seen that there are some long term side effects of using this product including hair loss.  This worries me since I will probably be using this medication for the long term.  I have very thick hair now, but I still don't want to risk it.  I know there is no official listing of this being a side effect, but should I be worried?  Also should I ask my derm next time I see him to switch to retin a micro?  I hear even though it is harsher than differin it works just as well and it does not have this side effect.   Actually it has the opposite effect from what I read and may help hair growth.