I have seen a few posts on severely frostbitten birds which showed blisters ...however I cant tell if your swelling is that or an actual abscess (if abscess>sometimes referred to as bumblefoot< it will need lancing/removal of abscess manually, however that will show itself in time)
To sum up (incl info on the ceph med that Peter Brown advised) I am printing out below for your vet (you said was not avian vet ... info below is from avian veterinary sources so print out for him):
http://exoticpetvet.net/avian/avianmeds.html
(general description of use of cephalexin in birds)
"
cephalexin, also a cephalosporin, can be given orally to treat susceptible bacterial infections, may be good for deep skin infections"
more info on cephalexin with
specific dosage info from the AVIAN WOUND MANAGEMENT site (veterinary source info):
http://www.worldwidewounds.com/2003/november/Cousquer/Avian-Wound-Management-Part-2.html
".....The wound below the right eye was allowed to heal by secondary intention as there was concern that penetration of the infraorbital sinus might result in complications. A broad-spectrum antibiotic (
cephalexin 100mg/kg orally twice daily) was administered until a healthy bed of granulation tissue was established...."
(as far as I know Peter does not carry this med and you will need to get from your vet)
confirmation of the above and specifc treatment measures from another avian veterinary reference I have pmd you as the copyright restrictions prevent it being posted on this board....
...one final note... be
careful of any topical creme with pain med in it following this warning from the AVIAN WOUND MANAGEMENT site:
http://www.worldwidewounds.com/2003/august/Cousquer/Avian-Wound-Assessment.html
"....Local anaesthetics should not be used in birds due to the suggested sensitivity of birds to drugs of the procaine group..." (so if you see "....caine" in any topical creme, it is best not to use on your bird)
ALOE VERA has been proven very beneficial on wounds of this nature.