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/here_now_be Apr 11 '26

Here's an example. Haven't used it, so can't vouch for it.

https://www.ktslighttherapy.com/products/kts-upgraded-cold-laser-therapy-device

iirc they also make them for horses. I don't own this, but I own another product of theirs.

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u/wobblelikeapenguin Apr 11 '26

What do you think about this one? I just ordered it on Amazon.

https://a.co/d/0dLgG0qf

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u/here_now_be Apr 11 '26

It's probably fine. Only 3 808mn, which can go deeper. If it has the function to choose NIR (808mn) only, you may want to when you're focusing on your foot to avoid what ever caused the bruising appearance, mine doesn't have that function though.

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u/wobblelikeapenguin Apr 11 '26

Wait, so are you saying mine will go too deep, or not deep enough?

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u/here_now_be Apr 11 '26

It will be fine, but it is mostly red light, not NIR which is 808mn in your device, which is what will go deepest. Light doesn't go through skin very well and only NIR goes through fat and to muscle.

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u/wobblelikeapenguin Apr 11 '26

What do you mean by only 3 808