Cellulitis is a bacterial infection in the skin. It's actual clinical definition is "a spreading inflammation of subcutneous or connective tissue". It appears as a swollen, red area of skin that feels hot and tender and it can spread. If left untreated it can become life-threatening and can spread to beneath the skin and to the lymph nodes. Lots of people get it and they use antibiotics to clear it up. It's usually simple, unless someone lets it go too long. Often it is caused by staph or strep and is usually treated with the antibiotic Keflex. Most times you take antibiotics for ten days and then you are fine.
It's actually not a virus, like shingles (herpes zoster virus) is but it can become a secondary bacterial infection for people who have shingles. Any open wound can result in cellulitis if someone is prone to it or has a weakned immune sytem.
If it gets worse then see your doctor and he can most likely clear it up no problem. It's not the herpes zoster virus.
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