blotch /blɒtʃ $ blɑːtʃ/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: Perhaps from blot + botch 'swelling' (14-19 centuries) (from Old North French boche , from Old French boce ; ⇨ ↑ boss 1 ) ]
a pink or red mark on the skin, or a coloured mark on something
—blotchy adjective
—blotched adjective