Milia en plaque (MEP) is an uncommon cutaneous disorder characterized by multiple clustered milia, which are small keratin-containing epidermal cysts of 1-2 mm in diameter, placed over the inflammed plaques. MEP frequently appears on the periorbital, preauricular, and eyelid, and rarely regresses spontaneously, posing a cosmetic problem. We present a case of a 51-year-old male who developed multiple grouped whitish papules on the both forearms. This patient has a history of Steven-Johnson syndrome (SJS) after the use of beta-lactam antibiotics in order to manage postoperative wound infection of a tibiofibular fracture. After two months of the treatment for SJS, variable-sized grouped papules incidentally appeared on the forearms, which was histopathologically consistent with MEP. The involved area in this patient is relatively uncommon as MEP affects most often on the face. In addition, since only few cases involving MEP caused by SJS are introduced in both international and Korean dermatologic studies, this case emphasizes the necessity of a continuous follow-up on the affected lesions in a patient with SJS.