May 28 (Reuters) - Wall Street’s main indexes opened higher on Friday as investors shrugged off data showing a jump in inflation, although recent worries about a spike in prices kept the S&P 500 on course for its smallest monthly gain since February. The Dow Jones Industrial Average rose 93.9 points, or 0.27%, at the open to 34558.5. The S&P 500 rose 9.9 points, or 0.24%, at the open to 4210.77, while the Nasdaq Composite rose 55.8 points, or 0.41%, to 13792.048 at the opening bell. (Reporting by Shashank Nayar in Bengaluru; Editing by Maju Samuel) Our Standards: The Thomson Reuters Trust Principles.