If you like your bro's ex or you both like same girl. Firsts thing you need to do is ask him or tell him whatever it may before doing anything about it.
Use Loofah while bathing, it exfoliate your skin. Dead skin cells sometimes clump around the top layer of your skin, making for a duller and less youthful appearance. Loofahs scrub this layer off gently and without disrupting the young and healthy skin cells underneath.