Louse
If you notice small red dots that look like mosquito bites in the places where hair grows — on your head, your neck, and behind your ears — it means that you have been bitten by head lice or pubic lice. If such dots appear on your back, belly, hands, or legs, they must have been cooties. The bites are a few inches away from each other, and the skin looks like it was pierced.
Lice transmit very serious diseases like trench-fever and typhoid.