Methods and apparatuses for the therapeutic application of energy to the skin. In particular, described herein are phototherapy dressings, phototherapy UV light applicators (sources), and methods of using them to treat skin disorders such as psoriasis. The dressings described herein typically include a support body onto which a medicament formed of a semisolid material (e.g., hydrogel) and therapeutic agent (e.g., coal tar). The dressing is configured to allow a substantial amount of the UV light within a target frequency range to pass through the medicament and dressing to the skin. Also described are phototherapy UV light sources that may be coupled to the dressings and may apply one or more therapeutic dose of light to the patient.
