Plantain. Plaintain, the broad-leaved kind. It doesn't fix everything, but it really does help. Pulp it as much as possible and load it into a bandage/poultice. It sounds flaky, but I've got a really long story that shows its usefulness empirically. Don't chew it. It's bitter. Unless you like bitter. Bonne chance, mes amis.
Bug bites and scratches