How long does it take for cellulitis to heal with antibiotics?

Depends: If cellulitis is bacterial and you have an antibiotic that the bug is sensitive to, there can be dramatic improvement(assuming you are in good health, etc). Might take longer to have a less sensitive bug respond. Lots of variables here, of course, but you get the idea. I hope you get well soon!

Depends: Really no one answer. Depends on many factors, but assuming straightforward case, you should certainly see some improvement with appropriate antibiotics within a few days, and resolution within a week or so.

What's the cause ?: Cellulitis is basically a visible inflammation (itis) of the skin and soft tissues (red, hot, swollen and tender) . It can be caused by many things including sunburn (radiation), trauma (sprained ankle) or poor vein circulation (stasis dermatitis). It need not be caused by bacteria. If you have repeated episodes of this, get to a wound care or vascular specialist, the diagnoses you have is wrong.