If you really want to know what they are, go see a doctor. We can't diagnose you over the internet sight unseen with a vague description like "small itchy bumps".
My guess would be flea (or some other small insect) bites, but that's just a guess.
warts
pimples.
Dysnidrosis
It's a rash.
see a doc.
Chickenpox causes widespread bumps, not clustered. Shingles or poison ivy are just a couple of problems that can cause a cluster of itchy bumps. See your health care provider for definite diagnosis and treatment.
you got something. go to the docter
You break out in turnips
Possibly skin blemishes.
its called hemroids
You need to go to your doctor.
signs of poor hygiene