I just moved my lager from my brand new mini-brew conical and as I was cleaning it i noticed a very small dot on the top of the conical that was not there before I used it. I tried to remove it but it just will not come off. When I touch it I feel a very slight tiny little gab and I keep thinking that its a scrash that was there before I used it for fermentation. I feel that it could ruin my next beer..What do i do?