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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
This is a typical area for an allergic reaction that is causing your sweet Porto to scratch this area so the pigment changes to black. You are treating with an anti histamine but this is not working well. The best way to treat this, which is called a "hot spot" is to apply a cortisone creme to this area after clipping away all of the fur. This will help keep Porto from irritating this area since the more he licks at this, the worse it gets and cannot heal. You may want to place an Elizabethan Collar on Porto, available at the pet store, to keep her away from this area to allow this to heal. I also apply Betadine to this area along with the Cortaid which will dry out this area so the bacteria cannot grow there.
This irritation on Porto's rear may be the same thing and you will need to use the Cortisone creme and try to keep Porto away from this area so it can heal.
Does that make sense to you?
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