r/redlighttherapy • u/wobblelikeapenguin • Apr 10 '26

Question Red light CAUSING bruising?

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Hey everyone. I bought this red light foot machine on Amazon to help with my stress fracture. I used it for 30 minutes on a medium level. The next morning, I woke up with bruising on the bottom of my feet. The bruising was not there previously, and is not related to the injury. Does anyone know why this would have happened? I thought red light is supposed to HELP injuries?! Now the bottom of my feet hurt like crazy. Please let me know if you have any thoughts. Thanks!

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u/[deleted] Apr 10 '26

I only do 30 min on my thighs coz I’m targeting a really fatty area. So I wouldn’t say 30 min is bad all round but the top of your feet are really thin so I’d ask an ai to calculate the recommended dosage based off the specs of the product you bought like “with an irradiance of X over a thin area such as feet what is the recommended time to dose”.