there is a herbal remedy that helped clear up my skin. it's called natures choice, you can search for it on drugstore.com
it tells you why people gets acme and how they can help you clear it up. it doesnt cost much $10 or more.
i always had acme and the dermantoligist gave me rentinA which dried my skin up so bad i couldnt even open up my mouth.
so i didnt think a herbal remedy would help but it did. you can also buy it a some CVS and walgreens stores over the counter. but you have to search the website so they can tell you which ones sell it.
it's herbs so your dad shouldnt be too concerned about it.
explain to him how having acne makes you feel bad and your anxious to clearing it up.
another suggestion is have you ever tried over the counter items that has salicylic acid (acne treatment) and benzoyl peroxide. these comes in the oxy pads and the cream.