Does a med spa in Wyoming need a medical director?

Short answer
The cited rules do not settle this — no cited rule requires a medical director; they establish only that treating any condition is practicing medicine, so a licensed practitioner must do it and licensees risk discipline for aiding unlicensed practice.

Wyoming defines “practicing medicine” broadly, and it reaches conduct a med spa does daily. a person is practicing medicine who advertises, holds out or represents to the public that they are authorized to practice medicine; who offers or undertakes to prevent, diagnose, correct or treat, in any manner, by any means, method or device, any human disease, illness, pain, wound, infirmity, defect or abnormal condition; who offers or undertakes to prescribe, order, give or administer drugs obtainable only by prescription; or who renders a determination of medical necessity or appropriateness of proposed treatment. Aiding or abetting the practice of medicine by a person not licensed by the board is a ground for discipline. On the cosmetology side the practice of esthetics is defined by purpose — the improvement and beautification of the skin for cosmetic purposes — and the Cosmetology Act does not prohibit services rendered by licensed physicians, nurses, dentists, podiatrists, chiropractors, physical therapists, morticians or barbers when exclusively engaged in the practice of their respective professions. The cosmetology board’s own scope rule then closes the esthetics question the statute leaves open: the rule enumerates the esthetics scope — massaging, cleansing, exfoliating, stimulating, manipulating, beautifying and applying preparations to the skin, brow and lash work, and extractions of the face are among the acts it lists — and then states that procedures which pierce the epidermal or dermal layer of the skin are considered invasive and are prohibited; the same rule says that using the term or title “Medical Esthetician” is not allowed.