11 year old son developed exteme blackheads on his nose past 2 months. Been scrubbng with acne/pore cleaner & toner but getting worse.?

See his doctor. I'd suggest having him see his pediatrician to ensure that this is common acne and not something else. If it is common acne, there are a number of prescription treatments for acne, some antibiotic, some not, and your son's doctor can work with you to decide what's best for your son.
Go to dermatologist. Acne is a very frustrating disorder. He might need prescription antibiotics topically and or orally.