Can not drying thick hair after a shower (i.e. rough towel drying only, then let rest dry naturally without blow drying) be the cause of a dry scalp?

YES: The moisture slowly leaving your hair via evaporation can dry out the scalp. It could also be your shampoo, some mold issues, or even poor thyroid function.

Not that I can see: Blow dryers, certain shampoos, skin conditions and medications can all cause dry scalp. There are at least 24 causes for dry scalp. Your dehydration is probably playing a role. When you get time in your travels, see a dermatologist for proper diagnosis and treatment.www.rightdiagnosis.com/sym/dry_scalp.htm ich wünsche ihnen schöne reisen und hervorragende gesundheit.