I have been diagnosed with strep over the phone but i have blisters on the inside of cheeks can strep throat cause that ?

Proper diagnosis of strep can be considered suggestive in a phone interview but is accurate only when testing is done. Many of the most irritated/blistery throats are viral, where antibiotics play no role in recovery.

Besides a good History, a good Physical in person or by Video will help in making the accurate diagnosis for treatment. if not restricted, a visit with the PCP or Urgent Care are options.