Yes, they can.
no see ums,there bug bites
If you live in the southern US or Carolinas it could be Chigger Bites.
If all over your body, could be bed bugs or flea bites.
its a deasease when u get red bumbs all over and have a fever and stomache ache
Yes.
Mix some salt with water and rub it all over your mosquito bites. This will help to sooth the itch on your mosquito bites!
Frost :)
Cramps. All over your body. You ache in pain for 28 days. You bleed, and cry.
Fluenza.
If you are experiencing several bumps all over your legs, it could be boils; seek medical attention.
Sounds like you're either sick, working (or working out) too much, or full of stress.