Conditions such as excessive oiliness, seborrhea, or even normal dandruff are all indications of a sickly scalp.
Get on a regular shampoo schedule based on the oiliness of your child's hair and whether or not it seems to need regular washing.
It is even possible for skin to have dryness and oiliness in different places on the face, neck and body.
Even men experience hormonally induced oiliness, which may result in acne.
You need to treat the oiliness and the acne, two separate but uncomfortable problems.