A massage in general will have many holistic health benefits but specifically massaging the head is good for many reasons the main two being:
Increases blood flow which can stimulate the hair follicles making the hair grow faster
Helps with fatigue, stress and headaches
The head massage should be slow and deep, physically moving the scalp with your fingers in order to stimulate blood flow. There are also certain essential oils which bode well with head massages and have other benefits.
Tea tree, soothes a dry itchy scalp
Lemon, helps control dandruff
Peppermint, acts as a natural cleanser
*always check the instructions for how to use essential oils as many of them are usually mixed with carrier oils before using.