What bug is this tiny thing?

I found one of those a while ago and killed it, not thinking much of it. Now weeks later i find these again. Multiple on my curtains and walls. They are very tiny, maybe just a millimeter big. I havent found any in my bed but immediately took down the curtains (made from cotton). Please someone help me identify them😭

Thank you in advance

u/Lenai_ — 18 days ago