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.
In addition to these health conditions, there can be other factors that may lead to scabs on scalp, including: Skin getting strained due to tight braids, perms and extensions. Lesions that form along the hair that start bleeding and turn into scabs.