Meaning: This means to rub your scalp with your hands to help your hair grow.
Choice of Words: Massage means to rub or press with the hands to relieve tension or pain. Scalp is the skin on top of your head where hair grows. Promote means to help something happen or develop. Hair growth is the process of hair growing. When used together, "Massage scalp, promote hair growth" means to massage the scalp to help hair grow.