What meds were given?
Sounds to me like this kiddo has/had pyoderma, which is an overgrowth of the naturally occurring staph intermedius - causing the bacterial skin infection. When that happens, Simplicef should be given x 30 days. A skin scraping is done to diagnose pyoderma, very simply done.
When allergies are present, the skin can become inflamed/irritated and out of balance...then the bacteria goes crazy and you have an infection.
Read this about allergies:
http://www.yorkietalk.com/forums/die...tart-here.html