Hello,My father is 74, caucasian. Recently over the last 4 months his face has gained a dark, black tone. it is not spotty on the surface, but rather appears dark under the skin and more prominent around eyebrows, ears, around ears and starting to move into checks. Any idea s? His mannerisms are changing as well. Less social, attentive, more tired. Could it be blood pooling under the skin, medication related? I am worried. Thank you.