Hi.
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern..
As per your complain it seems that there has been tear in the mucosa due to trauma that can be due to hitting with the teeth leading to a cut..
As a quarter inch cut does not need to get stitched and also the blood supply of the oral cavity is profuse that any
injury gets healed very quickly..
The would when heals continuously changes its colour and a pale or whitish appearrence is not to be worried for and it must e a phase of healing..
You should apply antiseptic oral ointment over it and do cool compresses..
Make her gargle with antiseptic mouthwash suitable for kids..
Apply antiseptic ointment over the pin head cut on the outside too to prevent it from getting infected..
In case if there is an increase in pain or swelling both inside and outside mouth then you must consult an Oral Physician or a Pedodontist to get her checked for infection..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.