Covered with or marked by blotches; having irregular spots or patches of color or discoloration.
From blotch (possibly derived from Dutch blot meaning 'spot') plus the adjective-forming suffix -y, creating an adjective describing something full of blotches.
Blotchy has been used since at least the 1600s to describe everything from bad skin to poorly made maps, and it's often used as a gentle way to describe imperfections without being too harsh.
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