The two types of staph infections are skin and invasive infections, which present with different sets of symptoms. The main factor that distinguishes these two types is that invasive staph infections have affected the internal organs. These symptoms can seemingly come out of nowhere or they can develop slowly and can be fatal if not treated properly. Pneumonia, sepsis, and endocarditis are all possible complications of an invasive staff infection. Luckily, the chances of developing an invasive infection are not nearly as high as those for developing a skin staph infection.