I Am 27 Years Old my Face Colour is Dark Compared to my Neck Due to Tanning of Face?

Well, first, wear sunscreen every day and over time you will see a lot of the color differentiation fix itself. Second, you could see a dermatologist for a skin lightening cream like hydroquinone that you could use in conjunction with your daily sunscreen. And lastly, you could consider some laser treatments done by a physician's office to help blend the uneven tone.

This is a common situation. If you do not wear suncreen with at least an SPF of 30 on your face this may be one reason. People tend to get "sun" on their face even if they are not trying to do so. In the summer a hat with a 4 inch brim is also helpful.