Rocker Nikki Sixx is facing surgery to repair issues with his sinuses. The Motley Crue bassist spent Wednesday seeking medical advice for his health problem and has conceded he may require an operation. In a post on his Twitter page, he writes, "Spent a lot of the day at the doctors.The 80s and the damage done. Yes the sinuses are a mess. Eventual surgery. The price we pay." It isn't the first operation Sixx has had to undergo - he went under the surgeon's knife in October to fix a knee injury.