Pain/redness. The signs of any bacterial infection are: redness, swelling, pain, heat. In medical school most of us learned the latin: rubor, tumor, dolor and calor (yes, doctors are nerds for the most part). :) these symptoms worsen along with the severity of infection (i.e. Dark fiery red is worse than light pink). If the infection gets more serious, you can have fevers as well.
Staph infection. Staphylococcal disease of the skin usually results in a localized collection of pus, known as an abscess, boil, or furuncle, depending upon the exact type of lesion that is present. The affected area may be red, swollen, and painful. Drainage or pus is common. When staph is in the blood (bacteremia or sepsis), it can cause high fevers, chills, and low blood pressure.