Speaking Wednesday at the general managers meetings, Scott Boras said Strasburg was bothered by the growth when he pitched. Boras said the surgery took place about a month ago and added, "He's fine now."
Strasburg, 27, was 11-7 with a career-high 3.46 ERA last season. He was on the disabled list from May 30 to June 23 because of neck tightness and from July 5 to Aug. 8 because of a left oblique strain.
Strasburg, who was sidelined from August 2010 until September 2011 because of Tommy John surgery, can become a free agent after next season.