Any unusual event following surgery should be shown to the surgeon for evaluation. Please do not trivialize what may be a complication of the surgery, even if it is a few inches away from the surgery site. Go, immediately,
You should go to a dental office or hospital emergency room immediately and have these problems diagnosed and treated. It sounds like an infection that could spread (even into your brain) and is very dangerous.
I would check the ingredients in your oral care products. Colgate Total contains triclosan (as an active ingredient )and triclosan reacts with chlorine in tap water to form chloroform - which may irritate his skin.
White pimples anywhere on the body make me think of abscesses or pus-filled pockets. This is common in areas w/lots of sweat & oil glands. This is also common in hair bearing areas and a natural consequence of shaving, too.