He is on 500mg Ceporex twice daily since 17/5/06.
Looking back through vet bills he has had the following (soory if they are not antibiotics but I am just picking word that possibly might be):
sulphasalazine 500mg (March 06)
ceporex 500 mg (Dec 05) - lots of times
Metronidazole 200 mg (Nov 04) - lots of times
Actually, looking at his records he does seem to have been on these tablets when he has been treated for what has been described as pyoderma but has the same but milder symptoms as now.
I think that the biopsy's will (hopefully) confirm this. How can a biopsy confirm drug allergy???

GG