Large fluid build up from vacuum hanging, below frenulim

Weird situation really, doing vacuum extending, tension of around 800g to 1000g so not very high. Everything looked fine post session. Go to get some groceries and pick the kids up from school, when I get home, maybe 1.5 hours post session, substantial fluid build up in essentially the foreskin below the frenulum.

Very much hoping this is one of those ‘dissipate in a few hours’ situations as I need this dick to be functional in 36 hours.