That is shingles on his neck. Herpes Zoster. That's a strong contributor to Alzheimer's.
I had shingles on the top of my head It's really painful I couldn't function for 3 weeks.
It seems probable that whatever they are infusing into his hand has lowered his immune response. Microbial Whak-a-Mole. My old friend....
Diagonal Earlobe Crease, a Marker of Coronary Artery Disease