I think i might have a staph infection. i had a group of red bumps on my leg and all of them but one didn't go away, now it's swollen, red, painful. ?

Skin infections: You should have your leg evaluated by your doc, of which you may need an antibiotic. Till you get to see your doc, keep the area clean with soap & water, dry it & if the skin is open, use topical Neosporin, which could cut down the amount of infection. Take Aleve (naproxen) or Motrin to help with the pain and inflammation. Do not wait to see your doc, these are only temporizing measures.