"Dark patches" refers to areas that are shaded or filled with darkness. It can also be used metaphorically to describe situations, events, or aspects that are mysterious, troubling, or difficult to understand.
Sentences with «dark patches»
Some dogs develop dark patches on their skin as they get older. (thedogbakery.com)
You may have also noticed darker patches of skin on your face, known as the «mask of pregnancy». (checkpregnancy.com)
The far side has significantly fewer of the familiar dark patches, formed by ancient lava flows. (discovermagazine.com)