Pansys are susceptible to midge infestations. I've haven't had a
midge problem with mine so I'm not sure what it looks like. You might
do a search on Google and see if it is a match. Also how cold has it
gotten where they are planted?

To assist in the diagnosis, I posted a new closeup of an infected
pansy on the site at http://www.inhouzemusic.com/panzy.html.

It's not a case of overwatering, as the only moisture they get is the
occasional rainfall, which hasn't been much lately. And I could be
wrong, but I don't think it's an insect infestation. And it's
actually been a relatively warm winter here in Northern California,
with temperatures hovering in the 40's and 50's.

Looking through my books, I'd guess that it's Gray Mold, and that I'd
need a fungicide to battle it. I have Safer Garden Fungicide, which
controls Powdery Mildew, Black Spot, and Rust. Might this stuff work
on Gray Mold as well? I've also heard a diluted mixture of plain ol'
milk serves as an effective fungicide as well. Any suggestions?