Will laser hair removal on my underarms and bikini line damage my lymph nodes or put them at risk?

There is no risk.: Laser hair removal may cause your lymph nodes to enlarge temporarily with the inflammation of healing but there is no damage or risk.

Possible but rare: Although your lymph nodes may become swollen as a general reaction the the inflammation, it is unlikely that the laser will directly effect the nodes.

No: The light from a hair removal laser will not penetrate deeply enough to significantly heat or damage lymph nodes.

Absolutely not!: Laser energy is light (at specific wavelengths, some invisible), not ionizing radiation. There is no risk of penetration deeper than a millimeter or two, and unless energy is set too high (burn can result), your lymph nodes are not affected nor are they at any risk at all. If you nodes are enlarged, it's not from your laser hair removal.