Welcome to Just Answer! I'm Dr. Hinson and I'd like to help you with your question.
It is really hard to say what it is or why she got this - especially since I can't see her. That being said though, it probably is a minor rash. It is good that it isn't bothering her.
Have you noticed her licking it?
It doesn't seem to be bothering her at all.
Any issues with urination?
Not that I've seen
Energy level is still good
You can approach this a couple different ways. If it isn't bothering her you can do nothing and just monitor it. If it doesn't get better in a 4-5 days then you can treat it with a mild topical medication
That was my thought as well. The hydrocortisone cream
It could be a mild heat rash which the hydrocortisone should help. If it gets worse or starts to spread you should take her to your vet as she may need an oral antibiotic.
I would try the hydrocortisone first personally.
You should stay away from a cream and use a spray. It dries better and is less messy.
The heat rash makes sense, we were visitng family in a warm area this past weekend
Any other questions?
no, that was it.
Well I hope the hydrocortisone helps. I wish you and Hazel all the best!