The word “oxymoron” has nothing to do with stupid people that use Oxy-5 to get rid of their acne. No offense intended. Oxymoron is a figure of speech, and which could be an inadvertent error, too.
Look at this sentence:
To apply for this job, you need the original copy of your exam transcripts.
You don’t have to . . . → Read More: Oxymoron (edited)