When he shot up his needle bent when it was in his arm and he missed a little bit out of his vein but where his arm bends there is a huge lump and its really white and swelling what should he do?

You just missed a bit. Take an ice cube and place it there until melts.....Then a very hot compress (wash cloth etc.) and place it on the abscess.....repeat several times.....Drink TONS of water and leave it alone......it will dissipate. Should be gone like by tomorrow

---IF NOT and it gets RED with pain and gets larger----GO TO Doctors ASAP

peace