Are sand fly bites poisonous, and should i see a doctor?

Not usually: Sandfly bites may leave large, red itchy bumps that may turn into a rash. These bumps are frequently several times as itchy as mosquito bites, and tend to last longer as well. Sand fly ties in the philippines can lead to a parasitic problem called leishmaniasis. You would not need to see a doctor unless you have an infection air are worried.