How long does it take for cellulitis to heal?

Depends: It depends on how severe it is. Are you on antibiotics? The body may actually repair the area for 6 months after the infection goes away.

Days, weeks or month: There are not set rules on absolute curing of cellulitis and I have seen cases that have required antibiotics for months.

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.

Usually quick.: Assuming that the appropriate antibiotic has been prescribed, noticeable improvement occurs within two to three days for cellulitis, to the point that should that improvement not occur in that time frame you should see your doctor again as a different antibiotic may be needed.

1-2 weeks: How long a skin infection will take to heal depends on many factors like i) the amount of skin affected ii) pre-existing conditions [diabetes, circulation, older age] iii) whether you can elevate the area e.g. foot iv) if you take your antibiotics on time & every time. Expect to see a noticeable improvement in 48-72 hours and then gradual resolution (redness, pain, size of rash) over 1-2 weeks