What works for hair ?

I have hair thinning and am starting with the itching, mostly on the sides of my body in the rib area, and my back.

I have hair thinning and a rash on my face.

No luck with hair-thickening shampoos. Use cortisone cream for neck.

I am doing nothing- just think it’s another “thing” to deal with. I try not to scratch it. Seems far worse in the heat so I assumed it was a heat rash.