For A Bout 6 Months I've Had A Soft Bump

For a bout 6 months I've had a soft bump under my right armpit under skin and gently squeezed it usually oozes out greenish white stuff alot of it or pops out sometimes on its own. I'm worried because it's every day and for so long and sometimes feels like pins and needles I'm scared to shave and I hate having the hair but I'm afraid it may be something serious. Please tell me.