Small Insects/Bugs on Wall

Hello, I am experiencing a large number of small bugs on the walls in my bedroom, as well as some in my living room. The source seems to be coming from the bedroom. The insect is very small, about 2-3mm long, its body is a light brown / yellowish brown colour and is much bigger in size than its very small darker coloured head. It has antennae but not sure how many legs they have. They can't fly but could possibly be developing wings (can't see them though). They tend to move very slowly and are only on the walls (also a few on my desk before). They seem to like the damp, humid corners of the ceiling. I think they could be coming from behind a fixed wardrobe in one corner of the room, where I can see some build up of dampness behind it. 2 days ago, there were around 40 - 60 of them on the walls, but I cleaned all the walls and sprayed behind the wardrobe and elsewhere in the room. I don't have any houseplants and I am certain they are not interested in my bedding! I think they could have developed from bacteria build up on the walls. Bear it in mind that I am in Hong Kong and it is often humid. Do you have any ideas as to what these insects could be and how I can get rid of them totally? Any methods to get rid of these little annoying bugs would be most appreciated.