The present invention relates to a novel liquid preparation for the topical treatment for itching and inflammation associated with psoriasis and other common skin maladies wherein a layered mass of organic and inorganic material comprising: 1) Fruits, vegetable by-products, and paper scraps; 2) Grit comprising a blend of crushed volcanic rock; and, 3) A microbial soil enhancer is composted by a population of selected earthworms. The composting mass is misted daily to achieve a uniformly moist consistency. For the first two weeks, any worm tea (runoff) exiting the composting mass after each daily misting is recycled into the next day's misting fluid. A fraction of the worm tea produced during the third through twelfth weeks is harvested, pH adjusted, and treated with surfactant to form the liquid preparation.