Booger like things growing on my walls

First question.

Do you Pick n' Flick ?

Did you confront your roomie on this?

How many are there at a time? Do they appear every day? What happens if you don't clean them off? Do they move? You said "growing". Can you explain? Are they all over your apartment or just in one room? Are they high up or low down? Are they the same colour?

They were many when I came to this house 4 months ago. Nobody lived there for more than 5 years before me. As I removed them from all rooms, only one room remains (both photos same room) that they still appear. They don't appear everyday. They stay the same place if I don't clean, not moving.
By saying growing I mean they mostly appear on wallpapers and rarely on fabrics, however one time I saw it on my tv screen. I stripped that off from the tv screen and after 1-2 days I saw it's grown again the same place on screen (that's why I think they're growing). I removed that and cleaned the screen with alcohol and it never appeared again on tv.
They can be high and low, the first photo is high and the second is low. Mostly same color (green-white), sometimes red (for instance, on the tv or on my clothes).

I've never heard of such a thing. Maybe take a couple to a lab and get them looked at. Or wash everything down with alcohol - seemed to work on your tv. Have you told your landlord?

Thanks for advice. I'm the owner.