Yes Tattoos can be removed if you regret. We don’t recommend removing tattoos at home. The most effective technology to remove tattoos is Laser Tattoo Removal. Watch How To Remove Tattoos With Laser Tattoo Removal.
If you want to know it a bit better, check out How Laser Tattoo Removal Works.
If you just want to remove tattoos from your photo. Here is how to remove tattoos in Photoshop.