Hello Sir I Am 18 Years Old. I Have Been

Hello sir i am 18 years old. I have been suffering from acne for last 2 years and with white heads on cheeks and blackheads on nose. I was consuming isotronin 10 and saslic ds facewash for 2 months. But from 2 weeks the acne and pimples have increased . So i started consuming tufacne 10 . Is it harmful to suddenly change the medicine or should i continue with it.