Per USA Today's Bob Nightengale, the A's expect Piscotty to miss at least one week while awaiting additional information from his pathology report.
Per the team's official statement, Dr. Joseph Chao identified a suspicious mole on Piscotty during a routine spot check.
Dr. Brian Parrett performed the surgery Thursday, and the melanoma was excised in its entirety.
Per SkinCancer.org, it's estimated 192,310 cases of melanoma will be diagnosed this year in the United States. Out of that total, 95,830 will likely be confined to the top layer of the skin and won't require invasive surgery.
Piscotty is in his second season with the A's after being acquired from the St. Louis Cardinals in December 2017. The 28-year-old is hitting .250/.314/.400 with eight homers in 65 games.