White Mustard Seed Classic Formulas … Natural Herb Library

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Warms the Lung and expels cold-phlegm ... Bai Jie Zi is used for cough, wheezing, chest fullness, and difficult sputum when cold and damp obstruct the Lung.
Regulates qi and dissipates nodules ... classical use extends to phlegm masses, scrofulous swelling, and focal hardness where cold-phlegm binds in the tissues.
Unblocks the channels and relieves pain ... especially through topical plasters or powders used on cold-damp painful obstruction, numbness, and swollen joints.

San Zi Yang Qin Tang ... classic three-seed formula in which Bai Jie Zi warms and transforms cold-phlegm in the chest.
Bai Jie Zi San and related topical plasters ... traditional external-use logic for cold-phlegm nodules and channel obstruction.
Pairings with Su Zi and Lai Fu Zi ... common strategy when cough, copious sputum, and chest oppression arise from phlegm-damp and qi stagnation.

Traditional materia medica describes Bai Jie Zi as acrid and warm, entering the Lung and Stomach to warm the Lung, regulate qi, scatter phlegm, and open the channels.
The herb is consistently framed as a cold-phlegm and nodule-dispersing seed rather than as a gentle food-like mustard condiment.