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Indentation like that is referred to medically as skin induration. It means that skin is becoming hardened, usually the result of some kind of inflammation or infection, cyst growth, fluid or blood accumulation.
It can be associated with rheumatoid arthritis also.
So if you think it's getting bigger in size then it should be evaluated.
You can elevate your leg.
Also monitor your blood pressure.
You should watch for any redness,swelling, discoloration around it as these symptoms are more concerning.
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