Canine skin infection - swollen submandibular lymph nodes
7 year old neutered Boston terrier 20 lbs located in Denver Colorado. Experiencing pustules on abdomen and now migrating up to neck. Noticed abdomen pustules 6/26. Saw primary vet on 6/30 for exam. Primary vet started on a chlorhexidine mousse twice per day. Did not notice swollen lymph nodes, stated other than skin infection everything was perfect. Received 3 year rabies vaccine in right hind limb. Noticeable swelling of submandibular LN yesterday. They are still squishy, but quite large. Images in Imgur address below. Would it be reasonable to take him back to vet to have these skin eruptions biopsied considering now he has swollen LN? The pustules on the abdomen are drying up and becoming less but he now has 3 crusty sores on his neck that were not there during exam on 6/26. Vet did not want to biopsy or skin scrape at previous visit.