For over a year now there has been a foul odor in my bathroom which some have said smells like a skunk. It comes and goes with some days being very noticeable while others not at all. My condo is only 3 years old. I had the maintenance worker cut 3 holes in the wall to see if he could see anything which he couldn't however the smell was very strong behind there. Behind the wall, it looked very dry with no water stains or mold and the pipes were tight and not leaking. His thoughts were that it is just a musty smell. I always have the fan going when in the shower and for about 10 minutes after. There are no windows in the bathroom. I do keep the bathroom door closed at all times when I'm not in it (which he told me not to do anymore). Is this what could be causing the smell? Thanks!