There’s a lump in my armpit and it’s been there for like 4 days. It’s about an inch long, 2 cm thick and painful. What should I do? Am I going to die? I’m only 14
looks like a skin infection don’t mess with it (scratch, pop, or touch) it’s probably not harmful, but try to consult a doctor and he might get a prescription for you. He’ll probably get you a topical ointment to put on. Really do consult a doctor for this.
Yes one day but not for many many years yet if you look after yourself and don’t smoke and stay fit and eat well and keep washing your hands
As for the swelling it’s probably a boil, ring your GP surgery and tell them exactly what you have told us and send email including the picture, they will either send you topical meds to treat it or whatever they deem appropriate.
These are caused by a hair follicle becoming infected, do not squeeze or touch but wash gently with antibacterial soap and rinse well.
Do not use deodorant or shave till its completely healed.
Stay safe and wash your hands thoroughly 
Take care of your self xxx