Diagnosed with Keratosis Pilaris aka Chicken Skin

My son, age 9, was diagnosed with keratosis pillars and after seeing his primary doctor and dermatologist, they both said that there isn't a medicine to cure or treat it. While the rough skin.tiny bumps do not hurt, he's of age and starting to play a part in his self esteem. I give him black soap and Cetaphil for moisturizer in the morning and organic coconut oil with aloe vera gel for moisturizer at night. I'm curious if anyone has ever dealt with this skin issue and how you went to treat it. Im interested in any OTC med, holistic treatment, creams, etc.

Thanks for your response. The dermatologist had mis-diagnosed him with a different issue prescribe him with hydrocortisone. Once I saw it was the exact same brand and strength she gave him for eczema, I went right back to her office and told her to try again. She said there is nothing she can try beside acidic skin peel but do want to try that until it's super necessary. 

i now use it so infrequently that i ran out of tretinoin unexpectedly. ordered some and it has been stuck in customs for forever. my skin reverted back so quickly, and i’m checking the tracking compulsively but nope, still in customs.