Discovering all of this was a very exciting side effect from fixing the rashes around my eyes.
So...experiment with alternatives to conventional shampoos...but you have to read the labels...organic and natural in big print don't count - and you'll need your glasses or a magnifying glass to do this. Especially watch out for any parabens or anti-freeze [ethylene glycol or propylene glycol in its "non-toxic" form].
Also watch out for "fragrance," as this is "proprietary" info, and so the manufacturer doesn't have to tell you the ingredients of the fragrance [and parabens are often used in them.
...and some advice I picked up in amongst my google searches...if you can't say it, don't use it [or eat it!!]...Ciao!