Tiny red bugs in my bed that looks like a lint ball?

For about 3 weeks Ive been trying to figure out what is biting me in my bed. Couple days I jumped up grabbed a lamp and seen 5 little moving red spots moving (the size of pin head) I squished it and it left a blood spot. Didn't see no legs, tentacles or nothing just looking like a moving red lint ball. They cause mosquito looking bumps the first day then go done to just a nasty looking bump. I thoroughly checked my mattress for residue, shedding, etc and nothing nor any other sign of infestation. What could these be if there's no signs anywhere else. The don't look like pictures Ive seen on bed bugs or clover mite..Please tell me what a moving red lint ball looking insect is.