Hi Guys,

Is this a potential water seepage? The mark appears on the ceiling of master bedroom toilet.

Please advise.

Hard to tell from your photo.

Use your hand to press a piece of toilet paper on the ceiling and see if the toilet paper gets wet or not. Or just use your bare handed to feel the ceiling. A wet ceiling will feel much colder than a normal dry ceiling. 

Also compare that part with the rest of the ceiling. Normally after the water dries off will leave a water mark which is slightly different color than the original ceiling paint