I have a very red and enlarged lump in my armpit.  I went to general practitioner on Thursday.  He prescribed G. E. Sulfamethoxazole twice a day for 7 days.  I have followed instructions and have washed with Hibiclens and warm water under that arm and have not used deotorant.   The lump is getting larger and is very sore and forming a whitish head.  Should I go to emergency room?
Hi. Thanks for your query. Noted the history and understood your concerns. Since there is enlarging red lump in the armpit in spite of Sulfamethoxazole and local application of Cubicles and warm water with formation of white head, this is definitely an enlarging abscess secondary to infected cyst or a boil. I would advise you the following in such a situation