Classic signs of whitespot (ich). The move last week probably stressed him out a bit, ich is a classic result of stress. Some people use the raised temps and salt method, others go down the route of shop bought medication, both very effective.
There's masses of info on this disease in the "freshwater diseases and health issues" section. Don't worry about it, it can be treated very effectively, your fish should be fine. Just follow instructions to the letter and when it clears up don't fall into the trap of stopping treatment prematurely, do the full recommended course of treatment, otherwise it will come back.
Good luck.