Meaning of “spotty” - Learner’s Dictionary

spotty

adjective uk us /ˈspɒti/
SKIN UK

having a lot of unpleasant, small, red marks on your skin:

a spotty young man with greasy hair
PATTERN

with a pattern of round marks:

a spotty dress
NOT GOOD/REGULAR US (UK patchy)

If an action, quality, supply, etc is spotty, it is not all good or regular:

Sales of tickets for the concert have been spotty.

(Definition of “spotty” from the Cambridge Learner’s Dictionary © Cambridge University Press)