Son 12 yr old has 2 smallish lumps identicle to each other on the back of his head? only slightly painfull when pressed down hard. they are no more than 1cm they feel hard not really moveable?

Possibly lymph node: With a little time ; effort most people can be taught to feel the small, non-tender pea sized lymph nodes in your neck. In that location they are often next to firm muscle ; not buried in soft tissues like they are in most of the body. If they become tender ; grow larger, they are reacting to something ; may need to be evaluated.Most benign nodes swell ; shrink over a 3wk cycle.