When Some Of Your Tan Won't Fade
Melanin plays a role in how our skin naturally protects itself from UV damage. As skin is exposed to the sun, it naturally darkens as a response. But once the tan fades, skin begins lightening back to its natural color.
However, when the cells become damaged with pigment, discoloration that doesn't fade occurs. In fact, it tends to stay dark unless you choose to have this hyperpigmentation treated professionally.
There is an array of treatments available, but in order to diminish hyperpigmentation, you must always protect your skin from the sun. Otherwise, you run the risk of it returning. Once you find a regimen that works for you-one that includes sunscreen, of course-stick with it to prevent discoloration from returning.