Cellulitis is a common bacterial skin infection. Cellulitis may first appear as a red, swollen area that feels hot and tender to the touch. In most cases, the skin on your lower legs is affected, although the infection can occur anywhere on your body or face.Symptoms · Risk factors · Diagnosis. Back to top. Changes. Last revised in July August — minor update. Information on the use of antibiotic treatment for cellulitis in children.