Once cellulitis has been cleared with antibiotics, can they bacteria lay dormant in your body and flare up again?

Bacteria: Don't lie dormant internally, but they are always on the surface

Usually not: unless the original infection was caused by resisint bacteria such as MRSA: uisually most physicians use double antibiotic therapy to treat cellulitis and to avoid resisitance or recurrence. If you had additional abscess formation, this could be an issue- consult your physician.

Cellulitis: Nope, if cleared up from the antibiotic then the infection should be gone from your body. It can always come back due to the bacteria on your skin, but its not because it was dormant inside your body.