I hope this is of some help....
I know of this problem this is what a friend was advised....
The pup was put on a course of antibiotics as its a type of skin infection (maybe pyoderma) seen in young and old dogs. Whilst the pup was on antibiotics they creamed well with aloe vera as often as pup would allow.... By the end of week the pus had turned to a scabbed look, bathed at end of week and it fell away, the skin still looked pink but kept up with the aloe and you wouldnt of known, some say sudercream is also very effective
Good luck x