Medically reviewed by Katlein Franca, MD Key Takeaways A wart is a hard bump caused by a virus and can be removed with over-the-counter products.  A skin tag is a soft flap of skin usually found in ...

Staphylococcus bacteria live on skin and can cause a staph infection if they enter the bloodstream. Staph infections can involve a range of symptoms, like vomiting, rashes or inflamed skin, and fever.