The nondi gel should be azelaic acid gel; blackheads are open pimples. Azelaic acid gel can cure blackheads; metronidazole gel cannot cure blackheads.
1. azelaic acid gel: can improve blackheads, reduce oil shine, inflammation and acne have therapeutic effect, but also can reduce post-inflammatory hyperpigmentation, so it can treat open acne.
Adverse reactions: Individual patients may experience tingling, burning and itching for a short period of time.
Contraindications: allergic to drug components are prohibited.
2. Metronidazole gel: is an antibiotic drug belonging to the antibiotic drug, used for the local treatment of inflammatory papules, impetigo, rosacea erythema.
Adverse reactions: occasional dry skin, burning, and skin irritation.
Contraindications: contraindicated in pregnant and lactating women.
Blackhead acne is recommended to go to the hospital in time to check, the drug needs to be used under the guidance of a doctor.