Consider admission for:
Extensive purulent bursitis
Extensive surrounding cellulitis
Suspected joint involvement
Immunocompromised
Failure to respond to course of PO antibiotics
Extensive purulent bursitis
Extensive surrounding cellulitis
Suspected joint involvement
Immunocompromised
Failure to respond to course of PO antibiotics
Septic bursitis
Olecranon bursitis 
Hip bursitis
Prepatellar bursitis 
Cellulitis
Calcaneal bursitis
Septic arthritis
Septic arthritis 