sorry you're experiencing this. it sounds unpleasant! unfortunately it's impossible to say what's going on without a physical examination. it's possible this is a boil in which case i would advise not popping it (which can allow bacteria to enter the wound and further infect your arm) but rather putting warm (not hot! ) moist compresses on it to draw out the pus. if you are running a fever or have any of these other health conditions you should see a doctor: heart murmur diabetes use of an oral or inhaled corticosteroid such as prednisone budesonide (symbicort) or fluticasone (advair) or if the bump doesn't heal up on its own with 10-14 days i wish you the best of luck with this!
what is this big bump on my arm that keeps getting more and more puss? . it is a large red bump that keeps getting more puss after i pop it and remove the puss.