Scalp micropigmentation (SMP) is a cosmetic tattoo that uses tiny dots of pigment to imitate short stubble or add the look of density. A hair transplant moves your own follicles, so real hair grows that you can cut and style. SMP can fade over time and need touch-ups, while transplanted hair normally keeps growing for life once established.Here is how each one works, how long each lasts, who each suits, and why some people combine…