Hello there, Thanks for your post on Healthcaremagic. I carefully read your query and understand your point of concern. I think your grandson is a teenager, And this condition is more common in teenager. So tell your grandson don t worry it is not a serious issue. It will resolve with time. Causes of acne is blockage of hair follicle due to many factor such as- Genetic factor, Hormonal factor, Infection, Following stress, Environmental factor. My advice to your grandson- Do some exercise and meditation for stress free life, Eat fresh vegetables and fruits, Drink plenty of water, Regularly clean that area with fresh water, Use clindamycine or erythromycine locally for secondary bacterial infection. I think it will help your grandson. Wish your grandsons good health. Regards Dr. Atiqul