ABSTRACT
Case 1 was an 81-year-old man undergoing treatment for the nummular eczema of the lower leg. The day after being administered the first dose of a COVID-19 vaccine, the patient developed generalized pruritus, multiple serous papules, and erythema on the trunk, upper extremities, and palms, as well as worsening of pre-existing eczema on the lower legs. The serum TARC level of the patient was 1,383 pg/mL. After taking oral antihistamines and topical steroids for two weeks, the erythema faded, papules crusted, and serum TARC level normalized. Case 2 was a 22-year-old woman who had been treated with topical steroids for contact dermatitis by poultices on the ankles. On the same day as she received the second dose of COVID-19 vaccine, erythema with pruritus on the dorsum of the feet appeared and gradually expanded to papules and edematous erythema on the face, extremities, and trunk. The serum TARC level of the patient was 2,090 pg/mL. After taking 15 mg/day oral prednisolone and topical steroids for 10 days, overall erythema became hyperpigmented, and the erythema on the dorsum of the hands and fingers persisted for approximately 2 weeks and then became pigmented. Serum TARC level normalized after the skin rash reformed. Case 3 was a 74-year-old woman with a history of asthma. She received SBT/ABPC therapy for acute cholangitis for one week. Ten days after treatment, she received the first COVID-19 vaccination dose. Two days after vaccination, the patient became aware of pruritus on the extremities ipsilateral to the vaccination site, and small erythematous patches appeared all over the body in a disseminated pattern. Her serum TARC level was 3,862 pg/mL. After taking oral antihistamines and topical steroids for 3 weeks, the erythema completely faded, and the serum TARC level normalized. The DLST showed positive by SBT/ABPC, but the result of drug challenge test was negative. There have been no previous case reports of rash with a high TARC level after vaccination. In the future, it is necessary to accumulate patients with a high TARC level by vaccination and analyze the clinical and pathological trends including immunological mechanisms. Copyright © 2022 Osaka University Medical School. All rights reserved.