Our cat had a hot spot under his chin a while back. If I remember correctly it can be caused by a number of things from stress to a physical environmental factor. We had started to use a new chemical spray to keep our cat off of certain places, so we thought that was the cause of his hot spot. We stopped using it, and put Neosporin (I think) on his hot spot and it got better. It heals pretty quickly but it takes a while for hair to grow back.
If you put the ointment on regularly, and try to figure out what the cause is, and eliminate the cause, you pup should be fine. It is not a major thing as long as you keep an eye on it. Make sure it is healing though because it can spread fast and get pretty nasty.
Well, good luck. I hope your baby will heal soon.
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