sphynx questions

Should I take him to the vet? The marks aren't raised, but on his neck he's got dry skin which he scratches.

I am going away on vacation tomorrow and I am just now noticing my little man's odd spots that have appeared. Does anyone know what these are? My first thought was Ringworm, but I am not sure! PLEASE PLEASE PLEASE help if you have any idea what this could be.

Hey guys, So Oli (1 year old sphynx) has been doing these weird twitching freak outs recently and the skin on his back starts rolling and he runs around like crazy. I looked this up and it is apparently Feline Hyperesthesia. Ever since he was a kitten, he always licks and chews his tail a lot...