Cellulitis is a common bacterial skin infection that affects the deeper layers of the skin and the underlying tissue. It usually occurs when bacteria enter through a break in the skin, such as a cut, scrape, or insect bite. Symptoms often include redness, swelling, warmth, and pain in the affected area, and it can spread quickly if not treated. Treatment for cellulitis typically involves antibiotics to eliminate the infection. In some cases, hospitalization may be necessary, especially if the infection is severe or if the patient has other health issues. Prompt medical attention is important to prevent complications.