This may be anecdotal...
The Indian sub-continent is in the rainy part of summer. It follows the mosquito population goes up.
So when I sliced my palm, I expected the mosquitoes to collect there in force. Yet whilst they continued to go about their business on the forearms, face and elsewhere - the blood flowing out of my palm held no attraction for them. This even after I deliberately stood still for nearly a minute! Perhaps the clotting process/platelets/etc were a repellent.
Why do mosquitoes not collect blood after platelets activate?