G'day,
when trying to locate the reason for a puncture, run your fingers all around the inside of the tyre. Your fingers will pick up any 'irregularities' that you may miss just by looking at the tyre. This should locate the source of your problem!. If not, is the puncture on the 'inside' of the tube?..ie the rim side?...you may like to check the rim as well for any problem, again...run your fingers around it. Small holes in tyres can be patched quite well with a normal puncture patch (or 2 to be safe) on the inside of the tyre.In many cases this will be 'thicker' than the rest of the tyre anyway. I probably wouldn't race on it, but training or commuting should be ok,
cheers,
Hitchy