An itchy scalp is the most common symptom of head lice. Other more common things like dandruff and eczema also can make the scalp itch.
You also can have head lice and not itch. It sometimes takes a few weeks after the lice arrive for the scalp to start itching.
Acne, medically known as Acne Vulgaris, is a skin disease that involves the OIL glands at the base of hair follicles. It commonly occurs during puberty when the sebaceous (oil) glands come to life - the glands are stimulated by male hormones produced by the adrenal glands of both males and females.