Welcome in H.C.M.
I have gone through your query regarding swelling of pinna of ear with blood mixed discharge and pain in and behind the ear of your friend,
Symptoms which you had told are clearly indicating that your friend is most likely having otitis externa
with associated post aural lymphadenitis
to treat it he should take-
(b) Clean the ear canal.
(c) Put ear drop containing antibiotic, antifungal and steroid.
I hope this will help him.