Teething questions

Gotta a couple of teething related questions for my 15 month old who is teething. I think his canines are coming through atm. He has a lot of teeth already.
1. Does teething turn #2s a reddy/ocre colour? Every other time he's teethed it has been one of those really acidic runny types that creates nappy rash. #2s was a greeny/browny colour. This time no rash.
I have been feeding him red jelly and fruit (one of those pre-made packs in the canned fruit isle) so could that be it?? Or is this something more serious?
2. Do toddlers get a rash around their mouths when teething? Looks like little pimples or even a shaving rash. He does use a dummy and thought it could be a saliva rash, but not so sure now.

Any observations based on your experience would be appreciated.