I've got surgery scars that do, on occasion, itch or tingle or sometimes even cause sharp pricking-type pains. It's mainly just nerves mis-firing, or your skin might be dry, or the air pressure is changing or there's a lot of static in the air - unless you see signs of infection, it's not something you really have to worry about.

After my knee surgery, my physical therapist tortured me every opportunity she had by massaging the scars to prevent them from adhering to the tissue under the skin & prevent them from developing keloids. It did pay off - I can barely see the little marks... I had pins inserted & removed from my leg as a kid when I broke it - and no one bothered with 'scar therapy', so those are deep & knotted & noticeable. Just get some good quality lotion & spend a few minutes every day massaging them. Your skin will thank you, and it's always healthy to be good to your own body.