Recurrent erythema nodosum after the second dose of the Pfizer-BioNTech BNT162b2 COVID-19 messenger RNA vaccine - Xiaotian Wu, MBBS, MRCP, MMed; Joel Hua Liang Lim, MBBS, MRCP, MMed; Joyce Siong See Lee, MBBS, MRCP, MMed, FAMS (Dermatology); Martin Tze-Wei Chio, MBChB, MSc, MRCP, FRCP, FAMS (Dermatology) (Elsevier, 2022)