Bubble hole on surface of plate

I was wondering if someone could guide me with a problem. I am new to glass fusing and as one of my early projects, I made an 8X11 plate and there wound up being a very small hole on the surface of the piece in the middle of the plate, apparently from a champagne bubble that was at the surface. The piece was sandblasted and now has a satin/matte finish and then slumped. Can someone please suggest a fix for this?