Common problem. Unfortunately the common flea may look to humans as a meal, attaching to loose garments and extracting a bit of blood here & there over time. They will eventually leave the human as their preferred sources have a different hemaglobin molocule that they find more nurishing. The papulovesicles left behind will usually heal without rx but may promote itching & excoriation & become secondarily inflamed.
Fleas. I agree with dr. Ferguson. Fleas can carry tapeworms & murine typhus. In some parts of the world to include the southwestern United States they can carry a bacteria called yersinia pestis which can cause bubonic plague.