What causes head lice in adults? What causes head lice in adults? It caused by pediculus humanus capitis – better known as the head louse. Head lice are small, strawberry seed sized, greyish insects that feed on the blood from the human scalp. They may also leave behind nits, or their eggs and remains of eggs. […]
Allergies to insects can manifest in symptoms such as rashes, swelling redness, or itching. It can be triggered by bites or stings. Learn more about insect allergies, here.