Thanks for your query
Your daughter is suffering from pyogenic skin infection
mostly caused by bacteria Staphylococcus aureus
. She needs proper hygiene care and antibiotic course as you are saying her forehead got swollen so it indicates that infection is spreading. Skin Infection can lead to secondary infection to kidney also.
So I would suggest you to consult a pediatrician
for proper diagnosis and clinical examination.
The treatment pf such infection in this age group is
1) Maintenance of hygiene by means of proper hand wash and avoid touching the infected part
2) Heat fomentation
2) Syp. Amoxycillin
+ clavulinic acid ( double strength) 5 ml TDS for 7 days
ointment apply locally twice a day
I hope this answers your query effectively.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Please accept my answer in case you do not have further queries.
Wishing you good health.