Greetings. If you find a particular medicine not usable or expensive- its best that you see the same doctor again for a substitute. this is important due to couple of reasons - 1. he has seen you, knows your marks and skin type and will suggest the best for you 2. in case his medicines are not being afforded by his patients, he should know, so that he prescribes suitable medications. Azelac lotion also comes with the name aziderm - but the exact composition may vary. its Best you see your dermatologist again.

I assume what you mean is probably post acne pigmentation or post inflammatory pigmentation. Targeting through a single agent may not always be fruitful. Meet a qualified Dermatologist to learn more about the diagnosis and treatment options. Combination of different therapeutic agents is always beneficial. The product suggested is food and effective. Alternatively you can use Melano TX cream or Aziderm cream. Avoid Sun exposure.