Thank you for your medical query at AskTheDoctor.com. I understand your concern.
This looks like a fungal infection, and I would advise you to apply Clotrimazole ointment mixed with calamine lotion 2-3 times daily for a week.
Additionally, she will also need Tab. Levocetirizine 5 mg once daily at bedtime till the patch subsides.
If the lesion seems to get worse even after the treatment advised, please get it examined by a dermatologist.
Hope this was helpful,
Feel free to discuss further,
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