I Have Multiple Bites On My Neck And Shoulder. Not

I have multiple bites on my neck and shoulder. Not sure what bit me but the itching will stop for awhile but then start back up for no known reason. They are red bumps now with tiny scabs. Not sure that is mosquitoes. Way too many bites very close together. Did not hear or see anything when I was outside for a few minutes. Did not notice any discomfort for until after went back inside.