The answer to 'mosquito trails' is that mosquito trails are a sign of a mosquito infestation in your home or yard. Mosquito trails are the small, dark spots left behind when mosquitoes land and feed on you or other surfaces. These trails are a clear indication that you have a mosquito problem that needs to be addressed.
Mosquito trails are caused by the saliva that mosquitoes leave behind when they bite. The saliva contains anticoagulants that help the mosquito feed, and this saliva leaves behind a visible trail. Mosquito trails are most commonly seen on walls, furniture, and other surfaces where mosquitoes have been landing and feeding. If you notice these trails, it's a good idea to take action to eliminate the mosquito population and prevent further bites.