It could be a number of things. There is no way of telling with out seeing a doctor. Unless you notice a pattern....for example, every time you use a certain lotion or eat something in particular it happens. Otherwise I would go see a doctor if it doesn't go away by itself. You can try taking Benadryl.
ye nans bummmmmmm
well if you 9-13 its prabably one of your first pimples and your starting puberty
pimples.
warts
It's a rash.
Dysnidrosis
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
Possibly skin blemishes.
its called hemroids
You break out in turnips
signs of poor hygiene