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Any history of injury?
Since how long has she been suffering from?
Waiting for your response.
I can understand your concern.
Well as you describe,possible causes may include Simple nevus,early stage of seborrheic keratosis,hematoma.
All these conditions are not life threatening.
And you can wait for few days to see a dermatologist with appointment.
You can soak her foot in warm water for 5 minutes and gentle clean it with betadine solution and dry it.
She can wear soft cushioned shoes.
As there is no pain,itching,swelling around it then you shouldn't worry.
In case she develops any associated symptoms or spot is getting bigger in size then see a doctor ASAP.
Hope this helps.
A hematoma is an abnormal collection of blood outside of a blood vessel causing such discoloration.
It can occur in mild injury also without knowing.
Her symptoms are not life threatening if she has no other spots on body or this spot is getting bigger in size.
Well mole or anything serious like melanoma doesn't appear in 24 hours.
Biopsy can be done to determine the exact cause.
Otherwise you can consider wait and watch approach if it's not getting bigger.