The combination of UVA light and psoralens is called PUVA. Approximately two hours before treatment, the patient takes psoralens orally as a pill. This allows the drugs time to circulate throughout the body.
The UVA light activates the drugs, destroying the cells the drugs came into contact with. Psoralens can cause nausea in some patients.
Externally applied ultraviolet light therapy is an approved treatment for several atopic, inflammatory, and dysplastic dermatologic disorders,
NOTHING like what your idiot dear leader stated.