Your pimple might have healed with hypertrophic scarring and that is why you are having an elevated painless lesion over your nose. If it is a hypertrophic scar deriva, clindamycin
etc won't work instead a single intralesional steroid
injection might be required. I would advise you to consult a dermatologist
so that both the diagnosis and treatment required can be delivered. Hope that solves your query. Take care.