A method of treating a disease of condition administering topically to the skin or exposed tissue of a human, a dosage amount of a pharmaceutical composition, said dosage comprising a therapeutically effective amount of a drug to treat said disease or condition and a form of hyaluronic acid characterized in that the composition is immediately available to transport the drug percutaneously into the epidermis of the skin or exposed tissue to the site of trauma or pathology of the disease or condition to be treated.