A nutritionally healthy diet with lots of 'greens' and veggies, low on refined sugars.
Plenty of water, not sodas or lots of sugary juices.
Gentle cleansing care of face, skin areas affected, but no use of harsh chemicals or makeups that irritate or peel the skin. Use a nano-silver creme as antibiotic over pimples...it is clear, has no scent and really helps.
And finally, time...maintaining in the above actions, time will assist in lessening the turmoil of hormonal activities that can help cause acne.