Here is a picture of Charlie with what I have referred to as a cat pimple. It is not really that. It is a sore spot about 3 mm across in the area of his whisker pad. It seems to be a slight lump too.
My feeling is that it is like a human spot on a teenager’s face. I am watching it. He is not scratching it as far as I can tell. There is no discomfort. If it is not a cat pimple or spot it could be caused by Charlie scratching his face. However, it is round and this does not look like it was caused by scratching. I could be wrong of course. There is nothing else like it on other parts of him, at the moment and I don’t think it is quite bad enough to see a vet about it, as it may resolve itself.