My 7 year old son recently began blinking constantly. his pediatric ian said it was most likely allergies and not to worry about tourettes.

Possibly a motor tic: This is likely if he is taking a medication for add or adhd.

Blepharospasm?: If this continues and junior doesn't obviously suffer from allergies involving his eyes, a visit with an ophthalmologist is in order. Some folks have minor movement disorders that cause a lot of blinking. Tourette's would be way down on my list.

Blinking: Blinking may be secondary to allergies, it could also be part of an innocent tic. Many children develop tics without it being tourettes. He might even switch his tick (shoulder shrug, cough, etc). He he starts having motor (blinking) and vocal tics (making noises) then you would be more concerned about tourettes. If the blinking is bothering him you could consider treatment. For now try to ignore.