The psoriasis medicinal bath formula is as follows: 1. The psoriasis medicinal bath formula can choose to add and subtract with Shou Wu Vine, Chicken Blood Vine, Tribulus Terrestris, Soapberry, White Fresh Skin, Broussonetia kozoensis leaves, Dioscorea, and Mugwort. If the rash is red in color, it can also be combined with drugs to clear heat and detoxify the toxin, such as Amaranthus, Daphyllanthus, and Panax notoginseng; 2. If the skin is dry, it can also be combined with drugs to moisten and relieve itching, such as Angelica and Shou Wu Tang; 3. Cortisone ointment or Denide ointment and other glucocorticoid ointment.