How to regain natural complexion which has become dull due to pollution n sun tanning?

Skin regenerates.: Stay away from sun as much as possible. No smoking. Protect your skin with hydration lotion with integrated sun blocks during the day. Dermatologist consult might help with special creams depending if you have specific skin conditions that go beyond the scope of this question.

Not easy answer: Unfortunately the damage from uv light of the sun and pollution cannot be simply reversed.A chemical peel under the supervision of a dermatologst can assist in the rejuvenation of healthy skin tone.The use of an Alpha hydroxy exfoliative along with a good moisturizer and sunscreeen can maintain healthy skin tone.