Some people experience hair thinning due to medication or medical treatments. Age and genes are other factors that contribute to hair loss. Even stress can cause your hair to thin. If you're embarrassed by bald patches in your hair, scalp micropigmentation can cover up the places where your scalp is visible. During scalp micropigmentation, a tattooist applies ink in very small dots all over your scalp. These dots look just like hair follicles, so they create the illusion of thicker, fuller hair.