For the past week or so like 3 hours after I go to bed at night I start getting these mosquito bite looking bumps that itch. They stay there almost all night itching like crazy. I only get them on my arms. I thought they were growing so I traced the outside of some with a pen and soon enough them went out of the line. They grow rapidly. They leave a few hours after I wake up, but leave these red dots. My arm is not covered in little red dots. I thought they were flees or spider bites so I washed my sheets but nothing changed. Its only when I sleep in my bed too. So what are they and should I buy new sheets? But what if its something in my mattress. Help!

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