Bumps underneathe tongue, some red, some white like pimples, is it possible to have herpes and only have an outbreak underneathe the tongue ?

POSSIBLY: But more likely another factor--perhaps related to the numerous salivary glands present under the tongue. Have your dentist evaluate you and establish a diagnosis.

No: Herpetic lesions are not likely to be limited to just under the tongue. Ulcers are generally self limiting and will resolve within 2 weeks. If they persist, or become too painful to function normally you can see a dentist to help evaluate and treat. They can have various causes. Of course the best way to know for sure is to simply go see a dentist for an exam. Best of luck, hope it's not too bad.