Hi Marg,
The bag balm website is:
http://www.bagbalm.com/
I really like this product myself, and have used it on my cracked knuckles in the winter and really does help heal it.
I love the malaseb also, it really helps clear up the skin infections(bacterial/fungal) that go hand in hand with allergies. If Oscar is of licking his area he could be opening the skin to infection by his continual attention, so using the malaseb would be a great idea! Do you use an Elizabethan collar on Oscar so that he cant lick? Try bathing him in Malaseb before and/or after the groom or have the groomer do it. Ask her to shave the belly first before the bath as he comes home irritated, then bathe him in the malaseb that you provide after she uses a *hypo allergenic* shampoo and leave on for 10 min. Since he is Mr Hyde for his belly I would not feel comfortable asking her to trim it with a small pair of shears which may not look as good or even either. If he was good for it, that would be an alternative so shaving it and possibly causing irritation.
There are other products that I have heard about that can help with "clipper burn" or irritations that they sell here in the US if you are interested. I have not had the pleasure of using them but I hear a lot of good things from other groomers, and want to try them:).
Oh and does she know he comes home irritated?