What are lumps in groin & underarm?

Within the past year i have sometimes developed lumps in the armpit and groin. The lumps have been small in size (about the size of a pinky fingertip) and have not been painful. The lumps would always go away within a few days. Recently i had a lump appear in my right armpit and quickly grew or swelled to the size roughly of a golf ball, bring extreme pain with it. A lump in the left armpit much smaller appeared as well but brought no pain. My Right armpit lump seems be gettin larger and more painful so i've stopped using my deoterant after researching the matter. My question to you is what do you belive this to be... Staph infection? (because of the multiple regoins of symptoms?) Swollen Lymph Notes or something perhaps more serious.... please contact me quickly because as a recent college graduate i have just found my self unemployed and without insurance and my parents are almost forcing me to the doctors (but i know a huge bill will follow so i'd rather treat this at home)
Chris