hi
welcome to healthcare magic forum
acne is cause by many reason like hormones ,drugs ,stress ,food etc
once you have good result ,you need to maintain it by applying retinoids cream twice a week.
avoid stress and take proper diet and sleep
never pop acne out or scratch it as it will leave mark for long time
there are laser and many other treatment available that will solve your problem
i hope i answered your question .

Hi Zeshan,
Even when acne lesions are completely gone, one needs to follow a skin care regime to prevent recurrence. For the same, use an anti acne face wash and water based moisturiser meant for acnr prone skin. Also use a sunscreen suitable to your skin type. On precautionary basis, one can use adapalene gel or treatinoin gel over the acne prone areas in night to prevent acne and pigmentation from occuring. Similarly glycolic acid and azelaic acid creams can be used too as they not only prevent acne flare but also tackle pigmentation. One can also take glycolic peels or salicylic peels as peels are quite effective against acne as well as post acne pigmentation. Take care.