Didn't get either side effect from either product myself. Never heard of anyone suffering from either side effect from SA. If you are predisposed to male pattern balding, then DHT and DHT products (like UH is) can expedite the hair shedding. I'd think getting notable acne from UH to be rare, but not impossible.
Some people get skin irritation from some topicals and have to rotate application sites due to it. But some have also reported better skin on the area they have been applying the topicals. I've used several different topical products and never had any effect on my skin. Allways good to have your favorite skin care product on hand when starting the use of topicals, just in case. Like something you'd use after shaving or something to that nature.