What happens when a hand ball occurs inside the penaltty box?

Answer 1

Generally not as it has normally stopped the goalscoring opportunity and many players do stop to appeal for a penalty to the referee. Advantage can be played but the only way this would help would be if the attacking team had already put the ball in the net or if it presented a player with an open goal, however the defender is still liable to punishment if it was deliberate handball

Answer 2

If the reff sees it and calls it, a penalty kick is given, if not everyone complains.