Is It Normal to Have a Water Blister Below the Incision Site? What Should I Do to It? (photo)

I just had surgery this past Wednesday, May 29th. My doctor told me I could remove the gauze today, which I just did. Everything looks good except there is a water blister (at least this is what it looks like) below the incision site (not on it). It is actually in between where the incision site is and the drain site is. Are water blisters common, and what should I do about it? Should we bust it or just leave it? Thank you in advance.