The present invention describes novel nanoparticle compositions, and systems and methods utilizing them for treating disorders and/or conditions associated with the epidermal and/or dermal level of the skin. Such disorders include acne, hyperhidrosis, bromhidrosis, chromhidrosis, rosacea, hair loss, dermal infection, actinic keratosis, facial wrinkles, muscle contracture, and headache. Methods generally involve administering nanoparticle compositions to the skin.
