I would see an internal medicine vet. It looks infection to me too (maybe related to the stuff in the nose), but you need someone on this that won't be dismissive.
http://www.acvim.org/PetOwners/FindaSpecialist.aspx (search for SAIM)
Not sure if this should be referred to a Derm though?
https://www.acvd.org/tools/locator/locator.asp?id=16
(looks like there is a Canada link there too) You might send a pic to a derm or call and ask if you should set up an appt, if there is one by you.