Etymology
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blotch (n.)

"a spot," especially a large irregular spot, as on the skin, c. 1600, perhaps an extension of blot (n.) by influence of botch or patch. Also from c. 1600 as a verb. Related: Blotched; blotching.

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blotchy (adj.)

"disfigured with blotches," 1799, from blotch (n.) + -y (2). Related: Blotchiness.

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macula (n.)

plural maculae, "a spot, blotch," especially on the skin or eye, c. 1400, from Latin macula "spot, stain," used of various spots (sunspots, markings on minerals, etc.), from Proto-Italic *smalto-, which is of uncertain origin. The macula lutea of the eye, the yellow spot of the retina opposite the pupil (the position of the most distinct vision), is from 1848.

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