Has anyone had sudden itching, followed by huge blisters on feet?

This is a shot in the dark. I have PN, non diabetic with tingling and burning mainly at night. Recently in the shower I rubbed my feet vigorously to dislodge dead skin. That night, first on one heel than the side of the other foot, an area became very itchy, followed shortly by a large blister, a quarter to half dollar size with sharp shooting pains at the site. Urgent care wants me to see my dermatologist. Could the rubbing have irritated my PN? I haven’t come in contact with anything, no new lotion, or food.