At a biological level it's a foreign body injury. Immediately after getting a tattoo there is pain, swelling, inflammation and many other of the bodies natural responses to such an injury. Except people don't treat this injury as something to be cured or fixed. Instead they want to override the bodies natural defense of expelling foreign bodies and keep the ink where it's at in their skin. When the tattoo finally “heals” the person goes on with their life but their bodies don't stop trying to fight against this injury. The body's immune system continues to fight the ink as if it were bacteria or a virus. Macrophages continuously attack the ink but don't really have much effect as tattoo ink is not bacteria. These macrophages instead end up forming a kind of barrier to try and keep the ink from “infecting” the rest of the body. Much in the same way a pimple fills with pus to isolate and expel a clog in the sebaceous gland, a similar reaction is taking place under the skin behind that tattoo where you can't see it from the outside. The only difference is that the tattoo is permanent, the immune system is simply not equipped to remove it from the body, at least not in any efficient way.
This message was edited 1 time. Last update was at 18/09/2022 04:54:58
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