<i>Staphylococcus</i> on Skin (IMAGE) University of Pennsylvania School of Medicine Caption This is a gram stain of Staphylococcus on skin. Credit Penn Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.