How do I treat lice?

Start with the OTC remedies available in any drug store or pharmacy.

https://www.webmd.com/skin-problems-and-treatments/lice-treatment

If at all possible, get him or her into the pediatrician asap to get the prescription meds which work much better. And clean the entire house from top to bottom. So so sorry!

OTC shampoo is a good place to start. After shampooing, coat the hair with a cheap conditioner enough to get a lice comb through the hair. After that, use a blow dryer. The high heat will kill the eggs as well. Make sure you either replace or suffocate anything on the bed that was exposed.

I have heard that mayo also works, leave on hair and put a shower cap over the hair for a few hours. Make sure to clean up anything that the lice or nits could have come in contact with. Hot water if possible, including all carpets, chairs, sofas (vacuum well for the furniture), bedding and clothing, including outerwear. For things that you can't wash well, like pillows, some comforters or quilts, etc. put them in the bags that you can vacuum down and leave them for at least a couple of weeks to make sure all have smothered.

I've also ready tea tree oil is a natural pesticide and kills lice. They make shapoo with tea tree oil in it! https://www.amazon.com/Fairy-Tales-Rosemary-Shampoo-Prevention/dp/B002OJDJ6M?th=1

Vinegar gets rid of them