its really noticeable if only one side of face has pimples
simply check if you do wash that particular area thoroughly while washing your face.
check out if your hairstyle responsible for making that side of face more oily.. !!
Surprisingly these are few commonest modifications that we can do
As far as diet is concern, balanced diet with plenty of liquids is main baseline.
other nutritional supplements could work.
Let me know the updates, surely.