I think you should do what YOU want to do - in my job I deal with suppliers, clients, give high profile presentations and deal with the public too - and Ive got one on my forearm which is about 3 inches by 1 inch and is highly noticeable - the only response Ive had about it from the bosses and directors at work is "Wow thats gorgeous" or "Thats really unusual" (its a cyber-angel, its beautiful!)
I would personally go for it - You can easily wear a long sleeve top if youre dealing with a client etc. Failing long sleeves, you could just wear a plaster to cover it - I always carry a wad of them JUST in case though Ive never needed to, or as its your wrist, a thick strapped watch, cuff, bracelet.... its easy to cover small ones so dont worry about it.
I would echo the point made by a few people - make sure you REALLY want it, but as you say its very small so I certainly wouldnt worry