Hi Helen K,
Thank you for your question which would help other patients.
I am a family doctor and I would NOT use fucicort for pimples.
1) Fusidic acid (an antibiotic) does not work very well against the bacteria in pimples.
2) Betamethasone (a steroid) might worsen the infection as well as worsen the acne. In fact long term use of this alone might also cause the acne.
It would be prudent to visit a GP or dermatologist if you want to prevent permanent scars on your face.
It is easier to treat them early rather than try to treat the scars.