What medicine should i take to have flawless, smooth and younger looking skin?

Sunscreen : The only products that have fda approval to claim benefit for skin including reduction of wrinkles are sunscreens. Many of the changes the skin undergoes over time including discoloration and wrinkling are due to sun. The inner aspect of the upper arm in most people is always more youthful in appearance than the outer aspect. Consult a dermatologist for treatment of existing dark marks & wrinkles.