rash / rashes in great size, red and hard on palpation; rash / rashes in great size, red and hard on palpation; rashes looked like herpes zoster; this is a spontaneous report received from a contactable reporter (consumer) from the regulatory authority-web. the reporter is the patient. regulatory number: gr-greof-20217658 (ra). a 52-year-old female patient received bnt162b2 (comirnaty), intramuscular, administered in arm left, administration date 31aug2021 (lot number: unknown) as dose 1, single for covid-19 immunisation. the patient's relevant medical history and concomitant medications were not reported. the following information was reported: rash (medically significant), rash erythematous (medically significant) all with onset 01sep2021, outcome "not recovered" and all described as "rash / rashes in great size, red and hard on palpation"; herpes zoster (medically significant) with onset 01sep2021, outcome "not recovered", described as "rashes looked like herpes zoster". clinical course: on 31aug2021 the female patient underwent the 1st dose of the vaccine (comirnaty). the next day of the vaccination the female patient developed several rashes located on the back of the left thigh and on the buttock. she also developed one of smaller size on the back of the left arm. rashes in great size, red and hard on palpation. the rashes looked like herpes zoster. which have been quite alarming to her (patient) as they were large in size, red in color and on palpation it can be seen that the subcutaneous side of the rashes have hardened and tend to spread to the same area by now. resembling external rashes of the type of erythema zoster. on 04sep2021 (yesterday) 1 more smaller and milder sized one appeared on the back of her left arm which she was monitoring if it tends to expand as well. observation: the above vaccination was performed on her left arm. no follow-up attempts are possible; information about lot/batch number cannot be obtained. no further information is expected