Wild plant forager teaches us how to make a plantain poultice. Plantain is good for bites and stings, rashes and scrapes among other ailments.
http://www.wildplantforager.com/1/post/2013/06/wild-medicine-how-to-make-a-plantain-poultice-the-right-way.html
Encyclopedia of Herbal Medicine: The Definitive Home Reference Guide to 550 Key Herbs with all their Uses as Remedies for Common Ailments
Rosemary Gladstar’s Medicinal Herbs: A Beginner’s Guide: 33 Healing Herbs to Know, Grow, and Use