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Welcome and Thank you for your query posted.
My name is***** and being a Medicine specialist I would be able to provide you with an appropriate solution to your concern.
Please note that my Goal is to provide you with an Excellent Service .
Before I answer your question I would like to get some more information:
Do you have a photo of the indentation ?
Do you have a photo of the redness that you can send me at your convenience ?
Please note that the answer provided is for information purpose only and does not substitute a Doctor - Patient Consultation in Clinic
Do you have swelling over the legs as well ?
No , you are not in any grave danger for sure.
Red and tingling sensation and feeling of the numbness on the hands is a sign of some peripheral neurological dysfunction.
This is not going to put your life in grave danger.
This can be due to the spinal nerve degeneration , autoimmune conditions like a scleroderma' raynauds disease which would need medical intervention like blood work up like autoantibody testing and medications.
Please do let me know if you have any further queries.
Thank you very much for your query.
This is definitely not gangrene.
The indentation is a sign of edema ( water retention )
It can happen due to anemia , protein deficiency or other conditions like kidney and cardiac issues.
Please do get back to me in case of any further queries.