Hi there. Thank you for posting your question with Healthcaremagic. I will do my best to help you.
This is probably an eczema
with some infection. Your daughter will need to apply a steroid/antimicrobial ointment like Fucidin
H. She may also need to take an antibiotic by mouth and she will need an antihistamine to control itch.
She really should see a doctor as this problem needs to be diagnosed and brought under control now. It seems to me that she has suffered enough already and there is no need for this suffering.
I hope that I have answered your questions fully and been of some help. If you have anymore questions please contact me again anytime.
Dr Andrew Rynne.