Cellulitis is an infection of the deep layers of the skin. It develops when bacteria enter through a cut, bite, or wound — including tiny breaks in cracked, dry skin. Common skin-dwelling bacteria, Staphylococcus or Streptococcus, are the usual culprits….

When I took up running in college, a friend of mine scoffed at the idea. He hated running and was convinced runners were “wearing out” their joints. He liked to say he was saving his knees for his old age….