Hi everyone. I am new to the forum and also a new homeowner. I have a small 2 bedroom house in southern CA that I purchased January of this year. When I bought the house a general contractor did a home inspection and pointed me to problems with bubbling and paint cracking/fraying on the ceiling in the master bedroom bath. At first I thought the water damage on the ceiling was from a leaking roof or skylight based on the pattern. The general contractor said the damage was more likely due to inadequate ventilation in the bathroom. The bathroom is quite open and has an open wall that channels into the rest of the master bedroom. The master bedroom is about 175 square feet not including the master bath. I would think there would be water damage elsewhere if it was caused by steam from the shower. The only thing I can think of is the steam tries to rise by the 1st skylight. There is a heat lamp in the small toilet room (it's like a closet with a toilet in it). There is a vent but there is no fan/exhaust. I've attached some photos. Does anyone have any thoughts on whether the water damage is from steam from the shower as indicated by the contractor, or is it likely from a leaking skylight? I am going to inspect the skylight again further once I can borrow a big enough ladder, but the contractor had looked last December and didn't indicate a leak there. It hasn't rained much at all this season and I can push the bubbling a little but I can't really tell if its very wet underneath it. I've not used the master shower much at all because I wasn't sure if the steam was causing the problem. I also make sure to use the heat lamp in the toilet room when the master shower is being used. My biggest problem is my significant other complaining about not being able to use the master shower whenever she wants. Thanks so much in advance.