Azelaic acid is the active ingredient of Finacea, Aziderm cream or gel among several other brands. It is an organic compound which is found naturally in wheat, rye and barley. It aids in quick renewal of the skin thereby reducing pimple and blackheads. It also kills acne and rosacea causing bacteria and hence it is used to treat acne and rosacea.<br />Azelaic acid may also be used to treat conditions not mentioned above.
Tretinoin is a drug that is prescribed for treating acne. This medicine is prescribed for peeling off the affected skin areas and also for unclogging the pores. Tretinoin is a natural metabolite of retinol and belongs to a class of Retinoids. Tretinoin is available in many other forms apart from capsules, like gel and cream form.