I have a painful lump in my right armpit and puss comes out of it and it stinks usually. i'm 17 not sexually active. pls help what can it be

Abscess : you most likely have an abscess. It needs to be opened and drained. Mir might be related to shaving your armpit. If it is a recurrent issue it can be hidradenitis. You need to see your family Dr.

Abscess: This is likely a pocket of pus in or under the skin. It can come from an infected hair follicle (particularly after shaving), a break in the skin, or an infected bug bite On some occasions it can come from an infected lymph node. Warm compresses to the area will help to draw pus out. You will need antibiotics and probably a MD to open the area for better drainage. See an MD ASAP.