Dense ink takes more sessions (12-15 often), but it can still be removed. The limiting factor is the laser's ability to shatter the ink particles AND your body's lymphatic system to flush them out. Some people's bodies are slow to clear ink. You might end up with a faint, chalky outline. Regarding keloids: this is critical. Laser tattoo removal works by creating tiny injuries in the skin. For someone with a keloid tendency, there is a risk of raised scarring. However, the risk is lower with modern Pico lasers (faster pulses, less heat) compared to old Q-switched lasers. You must go to a medical doctor (dermatologist) who can do a test spot. They will zap a single dot in an inconspicuous area (like the edge of the tattoo) and wait 3-6 months to see if a keloid forms. If no keloid, you proceed. If a keloid forms, you stop. Do NOT go to a med spa without medical supervision. You need a prescription for steroid injections if a keloid starts forming.