Are Visible Facial Veins a Sign of Thinning Skin?

This sounds like vascular proliferation for an unknown reason. See a Board Certified Dermatologist or Board Certified Plastic Surgeon to assess the problem.

Hi anon.  It's more likely that the appearance of facial veins is related to a hereditary condition like Rosacea than thinning skin.

Best way to find out more is visit a dermatologist to have a look.

AT your age, you should not be experiencing thinning skin. Discuss your concerns with your dermatolgist or ophthalmologist to ensure that no other problem is responsible for your observations

I would start with your pediatrician or pediatric dermatologist and thereafter get an opinion from a vein specialist. 

Greetings~

At your age, thinning skin isn't something you should be concerned about.  Vessels can become more pronounced with certain skin conditions (Rosacea, etc) and sun damage, or in the case of large vessels around the eye, if you are very thin they may be more noticeable as well.  You would be best served by consulting with a dermatologist that can advise you about your skin and what you can do to treat what's there and prevent new issues.

Good luck~

Dr. Grant Stevens   

I agree with Dr. Placik. Facial aging is VERY rare at your age. There are other much more common reasons for what you may be experiencing (Rosacea etc). See a good Dermatologist.