
Why Did An Indent Appear On The Left Side Of My Lower Back Like A Bruise?

Probably lumbar lordosis.
Detailed Answer:
Hello,
In my opinion, your symptoms can be related to lumbar lordosis.
The picture would be very helpful to confirm the diagnosis. You can simply upload/attach it here to the reports section for my review.
Some other pieces of information needed are:
- Your age
- Your gender
- The medical history and if you suffer from other diseases
There are many medical conditions that can cause lumbar lordosis.
Obesity and poor sitting posture are the main causes.
An MRI should be done to confirm the diagnosis.
I will be waiting for your pictures and other information requested for further evaluation and assistance.
Hope I have answered your query. Let me know if I can assist you further.

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