Worms can definitely cause pain and discomfort to your dog. They can lead to chronic gastrointestinal issues, inflammation of the intestines, irritation, blood loss, and overall fatigue. Dogs with worms often fail to gain weight as they should.

Your dog can get worms through two main ways: not being on a prevention treatment and exposure to an environment with worms. For example, if your dog has access to another dog's feces with worms in it, they can become infected. Additionally, dogs can get tapeworms through fleas if they are not on a good flea prevention treatment.

Recheck exams are crucial because they help ensure that your dog's condition has been fully treated and that no underlying issues remain unaddressed. Without a recheck, there's a possibility that your dog may not fully recover and may require additional courses of antibiotics or other treatments, which can lead to antibiotic resistance.

A veterinarian will conduct a thorough examination of your dog's skin, from nose to tail, and will look at the ears, belly, and all other areas. They will also ask for your dog's medical history, including how long the issue has been going on, any correlations with specific times of the year, and what medications your dog has been on.

Maintaining a clean environment and keeping your dog on flea, tick, and mosquito prevention can help keep their skin healthy. It's also recommended to bathe your dog no more than once a week, unless otherwise directed by your veterinarian. Ideally, a bath every two to four weeks is healthier for your dog's skin.

If you notice no improvement in your dog's skin condition after a day or two, or if the area worsens, it's time to consult your veterinarian.