The dry scalp and other skin changes are very common with ALS and other nerve related diseases like MS and Parkinson's... A few years ago, Baylor ALS Clinic began a study of skin changes with their patients, but I don't know what they found or even if the study was ever completed. This I do know, I never had itchy scalp and skin or dandruff... Before I had ALS and most of the other ALS patients I've asked didn't either.