Current medical status: Morbid Obesity, Severe Arthritus in Both Knees bone on bone, venus statious, high BP, Dry flaking skin on lower legs.
The data about the hard area on the inside of your upper thigh is insufficient to give a correct diagnosis, at least without seeing it. However, an assumption can be made. Considering the fact that you are losing weight, you might be experiencing a stretch mark. If a doctor sees them, he would recognize them.
Another possible problem might be a skin inflammation. The skin should be red, itching, or burning. The inflammation might be caused by bacteria, but too much friction can cause it as well.
Consult your family physician for the correct diagnosis.
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