I received the picture of Daisy. It looks like she likely has a "hot spot" aka Moist Dermatitis. This can be caused secondary to allergy, ear infections, or just because. We see it Retriever breeds most commonly. Don't get it wet, that will only make it worse. These are often smelly too and can spread very rapidly. I've seen dogs become very sick (septic) when it has spread over a large area of their body.
We all have our own favorite ways to treat them. A trip to your vet is definitely warranted. Typically we clip and clean the wound with an antiseptic. Depending on how bad it is, I sometimes also send some home for you to clean with wound with too. Also, an oral antibiotic and sometimes a topical is used. I would recommend getting Daisy in to see your vet ASAP.
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