The region is characterized by numerous marshes, brakes, sloughs, bayous, lakes, creeks, and rivers that in the geologic past were parts of the river bed.
If not treated carefully, necrosis will spread, causing skin, subcutaneous tissue and muscle to separate from healthy tissue and eventually slough with serous exudate.
Symptoms of selenosis include a garlic odor on the breath, gastrointestinal disorders, hair loss, sloughing of nails, fatigue, irritability, and neurological damage.