Daisy , there are two things. The stuff from Avon is skin-so -soft oil. I believe its for the bath, but some people find if you rub it on your skin the bugs don't like it. And it has the added benefit of making your skin so soft
The other thing is to increase your vitamin b levels.
Marmite, vegemite, Vit B compound tablets, lots of green leafy veg. Vit B is water soluble so you need a regular supply as you pee any excess out of the body.