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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.This is likely to be a fungal infection.A birth mark is also possible.It does not look like vitiligo.However, an examination by a dermatologist in person would be more helpful.Examination under wood lamp, skin scraping may be needed.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.