bacterial infection
"Took Clindamycin for 10 days for a severe parotiditis which occured after using a hot tub. Within days of finishing the dosage, I got a black and brownish thick fuzzy tongue extending to the back of my throat. This is day 25 after the start of Clindamycin and my tongue is still discolored and fuzzy but it's pretty much subsided. Also last Wednesday I developed a pleurisy in my left chest with severe pain radiating under the arm, no shortness of breath or problem with vital signs. Today, still have some pain on taking a deep breath.  Also with this medicine I developed a severe diarrhea around day 8 of the dosage and that too had subsided within a week. Drug did take care of my extremely swollen parotid gland and some incidental sore joints."