
Another possibility is of cellulitis
skin. Cellulitis is an acute infection of
skin and soft tissues characterized by localized pain, swelling, tenderness, erythema, and warmth. It usually follows a break in the skin, such as a fissure, cut, laceration, insect bite, or puncture wound.
I suggest you an immediate dermatologist’s evaluation. Till then apply some antiseptics and wear cotton clothes.