He does chase wasps in summer, so could be. Although it doesn't seem painful enough to be a sting. He doesn't even seem to know it's there - I only spotted it when he was sat on my lap with his big face about an inch from mine having his cheeks stroked back to make his face all slinky and siamese looking .
It's not red - it's skin coloured really. Looks a bit like his wee foot pad - that pinkish, spongy look. About the size of a small pea!