Cellulitis occurs when bacteria enter the skin through a scratch, cut, insect bite, or wound and spread into the deeper layers of the skin. The area may become red, swollen, warm, painful, or tender, and some people also develop fever or pus formation if the infection worsens. Since first aid did not help and cellulitis was diagnosed, proper medical treatment is important to stop the infection from spreading further. Treatment usually includes antibiotics, wound cleaning, and reducing swelling and irritation in the affected leg. Keeping the leg elevated may help reduce pain and swelling. The wound should be kept clean and dry, and scratching the area further should be avoided because repeated skin injury can delay healing. Doctors may sometimes recommend blood sugar testing or wound assessment if healing is slow, especially in people with diabetes or poor circulation. Increasing redness, black discolouration, fever, pus discharge, severe swelling, or difficulty walking should be reviewed urgently, as cellulitis can become serious if untreated.