During phimosis there is removal of the foreskin .It has no correlation with acne or any other skin problem. Acne occurs due to a blockage of oil underneath the skin and builds up with bacteria causing inflammation and develops into a pimple. The common causes of acne are poor diet, stress, genetic, dirt, hormonal imbalances, cosmetics, work-related and drugs. Avoid popping or scratching them. Drink plenty of water. Take a good sleep. If the symptoms persist then oral and topical antibiotics like Clindamycin and tretinoin/isotretinoin or accutane may be needed. It is important to diagnose and choose the proper treatment. See a doctor. Hope it helps.