I personally saw this in us in 1990.
I saw the glowing area underneath the skin.
Has it been hidden since?
Intravenous or intravascular laser blood irradiation (ILBI) involves the in-vivo illumination of the blood by feeding low level laser light generated by a 1–3 mW helium–neon laser at a wavelength of 632.8 nm into a vascular channel, usually a vein in the forearm, under the assumption that any therapeutic effect will be circulated through the circulatory system.[11] Most often
https://en.wikipedia.org/wiki/Blood_irradiation_therapy