Enlarged prostate is a potential side effect of steroids. This is usually common with older men, but it can happen to anyone. DHT, a by product of test, binds to the prostate and can cause this issue. Further, some steroids like var, winstrol and mast are DHT derived steroids. You won't get estrogen related sides from them, but you can get DHT related sides, such as this. There are drugs that block DHT. Dutasteride (Avodart) is probably the best route to go. .5mg 1x day is a good place to start. This should reverse the effect quickly. Be aware though. You don't want to take too much of a DHT blocker as it has it's own side effects.
Clen, T3 and GH do not effect prostate.