I have a closed room where I keep some furniture which is made up of engineered wood. By closed, I mean I dont keep windows open. Also in that room, I keep wet cloths to dry on cloths drying stand below fan (which is ON all time). The room is quite small. After some days, I realized something is wrong with my furniture. Some white/yellowish colored deposits were found on its edges as can be seen in below pics. When I cleaned, the edges were looking normal and undamaged. So, it doesnt seem to be termite. What is it, a fungus due to moisture in the room or anything else? Is it something to worry about? Should I do something to avoid it in future? I am thinking to keep my exhaust fan ON all time too. Will it help to get rid of moisture (if it is indeed happening due to moisture)?
PS: I have no experience in woodworking.