“…A chance observation of improvement of skin lesions of pityriasis rosea in two patients who were given erythromycin for upper respiratory tract infections, also confirms this hypothesis [9]. It has already been established that drugs like allopurinol, arsenic, bismuth, barbiturate, gold, hydrochlorothiazide, organic mercurials, nimesulide, d-penicillamine, clonidine, isotretinoin and ketotifen can cause eruptions resembling pityriasis rosea [10][11][12]. Ampicillin and systemic corticosteroids have been found to exacerbate PR [11].…”