Blots, blemishes (6)
I believe the answer is:
stains
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">blots</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know this)</span><br/ ><br/ >'<span class="explanation-format__original">blemishes</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(stain is a kind of blemish)</span><br/ ><br/ ></span>
(Other definitions for stains that I've seen before include "Discolorations or dirt marks" , "Dirty marks" , "Discolours or dyes wood" , "Discolorations or blemishes" , "Discolourations on satins" .)