What causes my dog's swollen, pussing lip sores and blisters?

That lesion looks very inflamed. It’s possible it’s a reaction to something he chewed on but an infection is also possible. I recommend to have him examined by his veterinarian to rule out something more severe like a tooth root abscess. He may also get medication to help heal the lesion. Best of luck.

These seem to be an infection, you might want to switch her water bowl to a stainless steel one as this could be the source. you will have to take her to the vet as this condition will require a course of antibiotics to resolve.

It could be an infection, cyst, allergic reaction, or mass. Have your vet take a look at the bump tomdetermine the cause. Your vet can do a fine needle aspirate to diagnose and then determine the best way to treat it. He may need an antibiotic, antihistamine, corticosteroid to treat or it may need to be removed.

The photos are dark and I cannot enlarge them but my best guess is that they are papilloma warts. I think you should have her examined by your vet to be on the safe side. This is not a normal presentation and I am a bit concerned that the lesions are symmetrical (same on both sides) and the lip looks slightly swollen.

This is probably due to a severe allergy, although it could also be infection or mites.

First of all, in order to rule out skin parasites, you will need to treat with a high quality flea treatment (advocate or advantage), then ask the vet to perform a skin scrape - this might reveal an infection or a mite infestation.

 If all of those came back negative, the next step is to treat the allergy symptomatically and try to discover the cause of the allergy.

 Three main type of allergies are usually affecting pets: food allergies, flea and parasite related ones and environmental type (allergens coming from trees, pollins, dust etc etc). Some medications can be given by the vet in order to repair the skin lesions (steroids and antibiotics). Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

Piper could have a resistant bacterial infection, chronic irritation leading to an infection/whiteheads or even a type of mite. Sometimes keeping the area clean and preventing any trauma such as rubbing or pawing at the area is helpful. Other times prescription strength medication is needed from your veterinarian.

Those spots on Jet could be several things including fleas, allergies, skin mites, bacterial infection, ringworm (which humans can get) or endocrine disease. There are a couple things you can do at home and they can help but they may not address the underlying cause. You can try adding in an omega 3 fatty acid supplement for dogs, this can help improve the skin health. You may also try changing his diet to something like Royal Canin or Nutro as they are aimed at skin health. You can wash the lesions once a day (not his whole body, just the lesions). Also protect the area from trauma by having your pup wear an elizabethan collar at all times. If the lesions do not start improving within a week or if they are getting worse, have him examined by the veterinarian. I hope this helps and please feel free to post any additional questions.