I'd want to make sure it's not bad plumbing before resealing and hoping it stops. Best way I've found (from experience) is cutting a small hole it the ceiling where the mark is, see if you can see anything obvious, then running taps whilst observing to see if you can see any water dripping/increasing in the area above the ceiling.
I'd want to make sure it's not bad plumbing before resealing and hoping it stops. Best way I've found (from experience) is cutting a small hole it the ceiling where the mark is, see if you can see anything obvious, then running taps whilst observing to see if you can see any water dripping/increasing in the area above the ceiling.