My younger sister has a really badly inflamed pimple looking spot on her top lip line, she is so worried about looking bad at school.
Clearacil advertises that they can visibly reduce pimple size & redness in as little as 4 hours. Stridex works really well too. AnceFree Terminator works to reduce the significance of pimples. Neutrogena sells a Blackhead Elminating Scrub. Proactive seems to have a lot of TV commercials, but I've never heard if it works very well. I know some of these treatments are just for regular pimples, but many of them will work for blackheads too. Good luck!
just cover it up while she's at school if she's that worried about it then, get an exfoliating pd and scrub at it with soap and water or any facial cleanser with sacilic acid. then it should be gone soon!