Kimberly, welcome to the forum!
Please let us know if the borax and hydrogen peroxide worked for you.
Aso DE Diatomaceous Earth would probably work.
Here are some threads that might be of interest to you or others:
https://permies.com/t/80/307/organic-war-fleas#5148
https://permies.com/t/623/kitchen/herbs-scabies
A recipe from the above link:
I would also take a garlic drink daily for a month as the garlic is offensive to many parasites and may help drive them out of the skin or help keep them from entering the skin, regardless, it is an extremely healthy drink and a maintenance of 1-2 days a week works wonders for supporting health and is very inexpensive. The drink directions are: To a blender add 1 – 2 cloves of peeled garlic, 4-6 oz juice (e.g. V8, tomato, etc., not from a can), can also add any liquids currently taking as well as some sea salt and cayenne), 1 TBL cold pressed organic oil such as olive or sunflower etc., or 1 - 2 teaspoons of vegetable based oil and 1 teaspoon of cold pressed Castor Oil, blend to liquefy, add 2 – 4 more oz. juice, blend and drink in AM on an empty stomach. Opt: can also add ¼ - ½ teas powdered ginger.