• (noun): A patch of skin that is discolored but not usually elevated; caused by various diseases.
    Synonyms: macula

Some articles on macule:

Cutaneous Conditions - Approach To Diagnoses - Morphology - Primary Lesions
... Macule – A macule is a change in surface color, without elevation or depression and, therefore, nonpalpable, well or ill-defined, variously sized, but generally ... Patch – A patch is a large macule equal to or greater than either 5 or 10 mm, across depending on one's definition of a macule ...