Black Tongue discoloration in 80 yr old w/ 5 d of fever & shoulder pain, Dx as septic arthritis from Staph. aureus (Rx/ IV cefazolin). Black tongue from Abx? (cephalosporins, PCN, tetracyclines, erythromycins, doxycycline, metronidazole moxifloxacin) https://t.co/lJ91yXOvQ9 https://t.co/mYqwCj3VEL