I had thin eyebrows before Chemo. But I had already had them tattooed.
I had them redone just before Chemo, after the Mastectomy.
I have no eyebrows now 2 years after finishing Chemo.
I have very little body hair now also.
In the past I have tried an eyebrow stencil, with reasonable results.I'm glad that I have tattoos now, as I need something to follow if I am to recommence with stencils.
Unfortunately the eyebrow tattoos fade, and need redoing. I don't seem to have a lot of choice.
Sorry I haven't had a dry scalp.