The Collaborative International Dictionary of English v.0.48:

Blotched \Blotched\, a.
   Marked or covered with blotches.
   [1913 Webster]

         To give their blotched and blistered bodies ease.
                                                  --Drayton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blotched
    adj 1: marked with irregularly shaped spots or blots [syn:
           blotched, blotchy, splotched]