Episcleritis, 170 , 173 –174 Epistaxis (nose bleeding), 1330 –1331 algorithm for management, 1331 f common causes, 167 t differential diagnosis, 166 , 167 t evaluation and decision, 166 –169 approach to diagnosis, 168 f physical examination, 167 Kiesselbach plexus in, 1331 pathophysiology, 166 treatment goals, 1330 –1331 Epitrochlear adenopathy, 312 Eponychia, 1342 –1343 Epstein–Barr virus (EBV), 157 , 163 , 308 –309 , 315 , 350 , 411 , 426 , 452 , 475 , 645 , 892 , 907 Equipment (from Gauche) for emergency department, 1e –3e for office or clinic, 3e Erb palsy, 558 Eruption cysts, 1317 , 1317 f hematoma, 1317 , 1317 f Erysipelas, 440 Erysipeloid, 440 , 441 f Erysipelothrix rhusiopathiae , 440 Erythema infectiosum, 642 f, 644 Erythema migrans, 352 Erythema multiforme (EM), 302 , 351 , 448 , 449 f, 452 , 455 Erythema nodosum (EN), 444 Erythematous papules, 350 Erythema toxicum neonatorum (ETN), 458 Erythrocyte enzymatic defects, 420 Erythrocyte membrane abnormalities, 420 Erythrocyte sedimentation rate (ESR), 237 , 306 , 315 , 328 , 403 , 907 , 1359 Erythrodermic psoriasis, 468 Erythromycin, cervical adenitis, 1327