Acne suggestions for 20 year old male on solodyn (minocycline) and retin a but still getting flare ups after 4 months?

Consider hard Rx. Adding spironolactone is one possibility, or moving to Isotretinoin is another. The latter is not for the faint-hearted.
STUBBORN ACNE. Stop nuts, peanut butter, chocolate and other sugary foods, and cut way down on milk and other dairy products. Continue on with your solodyn (minocycline) and retin-a. Be a bit more patient. Good luck.
Acne. It depends on the type of acne. If it is every cystic or inflammatory, the patient may need Accutane if four months of antibiotics are not working.