Itchy bumps without bite marks

Hi everyone-
I would love any insight anyone can share.

I started noticing that I had some red marks/bumps on my arm one night, its like they just suddenly appeared.
They started out very small and not very itchy but I made them worse by scratching. This made them bigger and itchier. At first I thought there was a bug around my room but I realized there was never any noticeable bite mark on any of these bumps.
I also thought it might have been an allergic reaction to my cat- ever since I got my cat 2 years ago, my allergies seem to be getting worse and worse I can barely pick up my kitty anymore.

Anyhow, I kinda ignored the arm bumps. Then about a week later I woke up and saw a red bump on my neck- again no bite mark. Of course I scratched and made it worse.

Now I started getting really paranoid. I thought maybe bed bugs but the fact that I didnt wake up with bite marks all over my unexposed skin made me think its not bed bugs.
Last night, I was especially paranoid and barely spent any time on my bed. However, I did spend awhile sitting at my computer desk. Before I went to bed I noticed I had another red bump on my finger, one on my other arm and another on my thigh. They just seemed to appear out of nowhere.
I wound up going and sleeping in another room!
The bumps have not gone away (again I made them worse by scratching them) and they still itch sporadically.

Now I am really scared/paranoid. I''ve always feared bugs and get especially paranoid even thinking about them.
But I am extremely confused- these red bumps/marks are so sporadic, appear out of nowhere and in random places on my body. Could they be dust mites? I admit, I haven''t given my room a good cleaning in a looong time and its very dusty because I don''t open my windows much.

If its related to allergies, should I get an air humidifier?
FYI I have always seemed to have skin problems since I was a kid. When I was little especially my mom would have a hard time giving me a bath because any products would leave red bumps on my body. I still notice that I am super allergic to certain things but the bumps usually go away and dont itch as much as these new ones.
In the summer, especially, I suffer from extremely high # of random bumps that I usually think are just mosquito bites.

I sprayed some lysol on the bed last night and looked closely and thought I saw a red/brownish stain and got scared it could be blood/a dropping but again, I''m quite paranoid and could just be looking for things that aren''t necessarily there.

Any thoughts/help, please? Thanks in advance!