HI I have gone through your mail, as you said that you having discharge of fluid from your ear initially there was pain also but now you have only yellow pus discharge which is fowl smelling but no pain. After listening your story I am suspecting that initially you were having acute otitis media (acute middle ear infection) not the boil, and your disease in now proceed to one of it s complication called as Chronic otitis media, at present most probably you are having perforation in your ear drum. You are advice to go for these investigations- (1) culture and sensitivity of ear pus, (2) C.T.scan of affected ear. (3) Audiometery Pure tone & Impedance. After this you should contact an E.N.T.specialist for examination of ear and co-relation of inferences of investigations for planing treatment in a better way. Thanks.