Schizonepeta & Siler Formula (exterior-effusing formula) EFFECTS: diffusing wind to free the collateral vessels; moving stagnation and vanquishing toxin. INDICATION: external contraction of wind, dampness and cold with heat depression syndrome; mutual contention of wind and heat; pathogen in the exterior; aversion to cold with fever; headache and painful stiff nape; cough and ejection of phlegm; nasal congestion and sore throat; acute lymphadenitis and flatulence; swollen abscess resulting from residual toxin, etc. CLINICAL REFERENCE: This formula is often used in treating suppurative diseases such as common cold; abscess; deep-rooted boil; furuncle; mastitis; head sore; urticaria; acariasis; empyema; allergic constitution . For severe suppuration, couple with Coptis & Scute Combination(Huang Lian Jie Du Tang). For skin itching due to allergy, couple with Tangkuei & Gardenia Combination(Wen Qing Yin).