When a mosquito bites you, what does it leave in your skin?
saliva, with blood thinners.
they Exchange blood with saliva that makes It itch and can carry diseases as well
It kind of leaves a poison that yes, comes out of their mouth in exchange for blood. Thankfully the poison isn't that strong so the most it does is itch and bleed of you itch it to much.
Their saliva and it has some chemicals in it that make you itch and it feels hot. Their saliva sometimes has poison in it. They exchange what they get which is blood.