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Pimples are multifactorial ,and therefore one has to find the exact cause of it.I would not suggest you any home remedies
,because its not going to help you in any case.Its important to have a clear and flawless face in a girl ,so please follow a proper medical therapy for her.
Acne can be because of wrong use of soaps to moisturizers or any fairness creams which one is using , to hormonal
disturbances (esp in females).So,a complete work up is necessary in all patients.Also one should remember that its not a short course treatment,but a matter of say 6 months or so if pimples are sever .
Firstly I would advise you to stop all cosmetic creams if your sister is using on her face. Also look for other features of hormonal imbalance in body like weight gain,irregular periods
,facial hair & scalp
hair loss.If she has any of these then get a hormonal profile done.In such cases conventional treatment for acne would not work,and one needs hormonal tablets to cure acne.
In case she doesn't have any hormonal imbalance & you don't respond to conventional treatment, then one can take retinoids
.Retinoids is a wonderful medicine for acne ,provided one gets all the relevant investigations and takes care of all the precautions associated with it.
First take treatment of acne and then once completely healed then go for treatment of scars
So,I would advise you to consult a good dermatologist
and follow his advice with the above things in mind.
I hope this answers your query ,if you have any other question you can write back to us.