I've had celluitus a few times. Everytime it's in my left shin. First time was the worse and ended up going to hospital and put on a drip for a few hours.
The other handful of times it's just been medication and cream. Though my body has now built up a resistance to it and now only really needs cream to ease it off.
This is what my leg looked like the first time I had it. The marker pen was to see if it was spreading or not.