Scalp micropigmentation (SMP) is a non-surgical cosmetic tattooing technique that is used to create the appearance of hair on the scalp. 

SMP is often used to create the appearance of a closely shaved or buzzed hairstyle, or to add density to thinning hair or balding areas. The technique involves creating small dots or lines on the scalp that mimic the look of hair follicles, which can be tailored to match the client’s hair color and desired hairline shape.
The overall effect is a natural-looking, three-dimensional appearance of hair growth.