Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns.
As per your complain it seems that you have got a traumatic injury
to the soft tissues inside mouth including a cut over the tongue and also injury to mucosa of the inner lips..
The cut over the tongue in case if it is small might not need stitches and it is also true that the blood supply inside mouth is profuse and healing will take place but it healing may take a longer time and might not heal in a week..
It can take atleast 2 to 3 week for it to heal..
You can apply a numbing gel over it, do warm saline gargles and take Advil
to relieve pain and inflammation..
Take soft diet
to prevent irritation..
The blackening of inside of lips seems to be due to bruising secondary to injury that might have led to trauma to superficial small blood vessels causing rupture and accumulation of blood into soft tissues..
Nothing to worry as it will gradually fade..
Doing alternate warm and cool compresses will help..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.