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I am Dr. Su S. and I will try my best to help you.
Ketoconazole shampoo has been found to be safe in different studies.
It is also most effective.
You need not to be worried.
Pus filled ones is likely to be a bacterial infection.
I would advise to get an examination by doctor.
Antibacterial cream may be needed in addition.
I hope this information will be helpful.
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Wish her healthy life.