As adjectives the difference between blotchy and splotchy
is that blotchy is covered in blotches while splotchy is marked or covered with large, irregular spots.
blotchy
English
Adjective
(er)
Covered in blotches.
Synonyms
* (covered in blotches) blotched, spotted, spotty
splotchy
English
Adjective
(er)
marked or covered with large, irregular spots