Polypharmacy, very common in the elderly, and the possibility of drug-drug interactions must be considered as a cause of agitation. Medications such as benzodiazepines, beta-blockers, selective serotonin reuptake inhibitors (SSRIs), neuroleptics and diphenhydramine can cause problems.
Sun Damage. Overexposure is one of the main factors in scalp wrinkles (and wrinkles elsewhere, too). UV radiation speeds the breakdown of elastin and collagen, two things that keep skin tight and firm. As these degenerate, skin begins to sag and wrinkle.
Stress can affect dandruff, too. For instance, it can cause conditions like seborrheic dermatitis, which is characterized by an oily, waxy scalp and white or yellowish-brown flakes, to flare up [source: American Academy of Dermatology ]. One major contributor to itchy scalp is the skin condition called psoriasis.