I don't know what bugs are in the room. They are often bitten. How can I kill them?

I suggest you use mothballs or mothballs and put them under the bed, bedside table and in the gaps around the bed. Camphor can't kill insects, but it has a good insect repellent effect. If this is not enough, I suggest you use a stronger pesticide (dichlorvos), keep the dilution ratio of dichlorvos low, and thoroughly spray the dead corner of the room. Be sure to spray more and more, and then close the door for half a day. And mop the seat clean (the spraying area must be cleaned). If the smell of dichlorvos at home is strong, it is necessary to drag it a few times and spray some air fresheners appropriately. Camphor and dichlorvos can also be used together. If this doesn't work, you have to consider other reasons.