Other Pest's Bites Mistaken for Bed Bugs Mosquitoes: Mosquito bites are very itchy and can sometimes transmit diseases. ... Head, body, and pubic lice: The most common symptom of head lice is itching of the scalp due to sensitization to allergens in lice saliva. ... Ticks: ... Fleas: ... Mites: ... Spiders: ... Carpet Beetle Larvae: ... Psocids: Read more...