Mosquitoes will most often bite part of the body that is not covered by body hair, such as the feet or ankles.
Even minimal body hair provides adequate protection against mosquitoes, because hair is sensitive and it allows you to detect the presence of mosquitoes and other insects on your skin.
Body hair also provides a buffer and prevents a mosquito from landing directly on your skin, which prevents it from biting you.
Therefore, common places where mosquitoes bite are the back of your hand, feet, ankles, and on the face.
Women who shave their legs will also find that they receive more mosquito bites on the legs for this very reason.