

I was once renting a room, where due to part my lack of cleanliness (basically not throwing out garbage frequently enough, i waited for a week or two) and my rooms window being right above a flower bed (and i kept the windows open for the most time) and my room being moist for the most time (i dried clothes in my room) I got lots of small red bugs (hundreds or thousands). they did not bite, but they were annoying. I had a few bad weeks, so i also did not care about them at the time.
To get rid of them, I had a multi part strategy, basically 1 was trying to physically force them out - by raising the room temp to high, and cycling window open and close, and also cleaning out my room better (taking garbage every 2 or 3 days), worked partially well (maybe more than half gone). Other was to use a chemical irritant (i used a mix of dettol and water) to spray on their usual spots, and llet them be dry otherwise, and stopped drying clothes inside. Once I got to getting rid of them, I got it in a week or so.
Also where i live currently, it is musquitos. They are everywhere where I live, kinda a public health issue which is largely outside our scope. I cant really do much against them. General advice is to keep surroundings clean and minimise their breeding spots. My folks do try to kill them with the zapping rackets, but that is almost lost cause.
Sorry for hijacking this comment.
In many places, especially with big hospitals (or universities, or some big establishment) - Most of them have some form of blood donation camps, especially around major holidays (often the national ones).
Please donate blood - you can safely do it 3-4 times a year, and be completely healthy (you can do once in roughly 90 days for males, and 110ish days for females, but please confirm this with your general physician). But even if half the people (even a tenth for some countries) do once per year, we will not have a blood crisis.
And you can always register for organ donation or organ matching/swapping (depending on jurisdiction) - after you are dead, or if you are terminally ill, but have some organs (for example - eyes, kidneys, liver, etc) which function normally, can be donated. Often this is as simple as getting a registeration done, and then just maintain a card with your health records. In case of death or otherwise, most hospitals will then arrange for grafting and storage of organs themselves, with little to no headache for patients family. And in many places, the organ donor is then given some kind of state honor. This also helps reduce organ trafficing, and abuse of poor people who sometimes have/forced to sell their organs.