Welcome in H.C.M.
I have gone through your query regarding a painful swelling on anterior part of outer ear initially this swelling was filled with fowl smelling pus which you were able to squeeze out pus, but after some time this reoccurs again and again.now you have only swelling and no pus in it.
I think you are having problem in your Tragus of external ear,initially you were having boil in external ear over the skin covering tragal cartilage
and at that time it was painful and bad smelling pus
was coming out on pressing it, as soon as time had passed infection extend to deeper tissue (tragal cartilage)because you were not taking any proper treatment. I am suspecting that now you are having tragal perichondritis
You are advice to consult an E.N.T.specialist as you need specialist care.