Erysipelas is caused by hemolytic streptococcus. It commonly occurs on the dorsum of the foot, the lower leg, and the face, and is usually unilateral. The onset of the disease is generally acute, with typical skin symptoms mainly presenting as edematous erythema, with clear boundaries, tense and shiny surfaces. The skin lesions can rapidly expand outward, accompanied by various degrees of systemic toxic symptoms or lymph node enlargement. The condition often peaks within four to five days, and after subsiding, the affected skin areas may have mild pigmentation and desquamation.