Hi. Don't pop these spots. That can spread bacteria under the skin leading to future spots in the same place. It can also lead to delayed healing time, secondary infection and scarring.
This doesn't sound like acne pimples which commonly occur on the face, chest and back. It may be keratosis pilaris rubra, see your doctor for a definative diagnosis. You may also wish to repost this in the Dermatology Forum, as I am only an expert on acne.