I have these issues from time to time, with my pack of terrors.
What I do is clip the hair surrounding the area short (shaving not necessary) and clean the area. Try to figure out what is causing the hot spot. It could be a bug bite. If so, it will pass quickly. If it is an allergic reaction to whatever, apply a tea bag to the area for a little while. Soak it in hot water, then let it cool, please. The tannins in the tea will help. You can also try bathing the area in warm salt water several times a day. Sometimes I get better results with apple cider vinegar. Witch hazel (available at a pharmacy) will also help cool and dry the area. Stubborn hot spots can get relief from cortisone skin creams.
If these don't help after a few days, a vet will be necessary as it could also be a mite infestation or even mange. This should be treated by a vet.
You can ask a vet online for free
here.
They helped me diagnose a flea allergy in my Golden Retriever some years ago.
I hope your little companion gets better soon!
Brian