Bubble raised on the skin (7)
I believe the answer is:
blister
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bubble raised on the skin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for blister that I've seen before include "Bubble-like swelling on skin" , "Effect of rubbing on skin" , "Thin bubble on the skin" , "Bristle (anag.)" , "that's swelled up" .)