My 7 yr old is starting to tic. He started to blink his eyes three weeks ago now it's progressing and getting worse. He seems to do it once a minute?

Tic's common. Tic's occur in ~15% of schoolage kids and are usually transient, lasting up to 6 mo. Some are related to infectious agents, some become chronic, some <1% actually represent a syndrome of facial//oral activity calles tourette syndrome. Write down all you remember about how/when it started & take kid & info in for review with your dr.
See doctor. Is he on medication? Tics are a side effect of some medications. They can also be a marker of something more serious in the brain. He needs to be evaluated.