The mysterious bald spot
Hello everyone! I have kind of a multi-part question I am hoping to find the answers to, and, being new, I hope I have posted in the correct area (it begins as a grooming-related issue that turns into a possible health issue).
Our 1-year-old Havanese, Emma, has a tendency to get knots in the groin/front thigh area of her back legs. I haven’t been able to find any information online as to why this specific area is affected, but I am guessing it might have to do with her movement or how she lays down. Though we brush her out daily, there was a time about a month and a half ago where she had such a terrible knot that I brought out the scissors. I carefully cut the knot out, leaving about 2 cm of hair behind, which wasn’t too noticeable on her puppy cut body.
The problem is, as her hair grew out, the trimmed area did not grow out, and actually has lost hair. It looks like there is some hair there (please see photos), but it feels stubbly as if someone shaved the area and now it is growing out. I see no signs of “phantom razorburn”, irritation, redness, bites, or otherwise (one of the photos looks a bit pink but it isn't any different than the rest of her pink/purple/black skin; actually, as you can sometimes see irritation of the skin better in correctly lit flash photos, we even took a bunch of pictures to analyze for spots we might not have seen with our eyes alone!). She is up to date on all shots, as well as flea, tick, and worm treatments. She does not have any known allergies or health problems. She has never had a problem with her hair growing back after coming from the groomers, and even after she was spayed her hair grew back normally.
We spend the majority of our time with Emma, as our work schedules and living in a dog friendly country (Germany) mean we almost never have to leave her home alone, and we have never witnessed her chewing or licking the area.
We have waited for the hair to grow back for this last month, and, as there is no irritation visible, we have put off going to the vet. I thought it might help to put some triple-antibotic ointment on it (not sure why, my mom used to put this on me anytime something might have been wrong), but I don't want to draw her attention to the spot when she isn't bothered by it. It is time for her to get another haircut, so perhaps the bald patch will magically be spurred to grow back? Does anyone know what the problem could be? Any suggestions for how to re-grow the hair or how to keep the area tangle-free in the future? Thank you in advance for reading and for any insight you may have!