I have flesh colored bumps on the back of my neck, in the hairline. What could this be?

Acne keloidalis. Acne keloidalis nuchae (akn) is a scarring form of chronic folliculitis that manifests as follicular-based papules and pustules, which eventuates in keloidlike lesions. The lesions are most pronounced on the occipital scalp and the posterior part of the neck. See your doctor to make sure of the diagnosis.