This works on mosquitoes, bees, wasps, biting flies, sea lice, and more (although TBH, if this list of bugs gets any longer I may just stay indoors forever!!).
Promising review: "I have always suffered, so badly, from mosquito bites. For some reason they love me and I get more bites than the average person.I get giant welts that itch for days that most anti-itch creams don’t even help. Itching turns them into open wounds, and I even have some scars from some old bites. I saw a post on Facebook about 'The Bug Bite Thing' and I bought it on Amazon as a last resort.I am absolutely in love with this product! It is the first thing I’ve used that stops the itch permanently! I am so happy I found this product.I've even used it on my children aged two and seven. I highly recommend this product!" —Megan
Get it from Amazon for $9.95.