As other doctors have noted, you can technically blow your nose (gently) about two weeks after undergoing rhinoplasty, although I suggest that my patients for several weeks before blowing their nose or using tissues, with four to six weeks being the ideal length of time. If you blow your nose too soon after surgery, you may risk tearing a scab, having tissue stuck within the nostrils, causing a blood clot, or minimally causing some pain to your newly-refined nose. If you absolutely must blow your nose, please do so gently and make sure that you do not place anything within the nostrils (tissues, fingers, etc.), or else you may inadvertently introduce harmful bacteria to the nose and cause an infection.