Water damage located beneath master bedroom, shower water is not continually dripping that we drain is most likely the issue. Upon examining the shower and over this is a pre-fabricated base and the drain connection for those is often either not fully tightened or uses an inadequate amount of sealant Being that lines up very very closely with the stain underneath that is the most likely culprit recommending removal of the drain resealing and then re-tightening of the drain.