Hi, thanks for writing to HCM.
I don't think that there exists a relation or link between your thigh pain and rash
in your hands and both of them may be different conditions.
Presence of pain, tenderness and warmth over the swelling indicates that it is of Inflammatory origin. Propably, this swelling might be causing pressure over the surrounding neurovascular structures in the upper thigh zone producing the symptoms of tingling
scan of the involved area will diagnose the extent and nature of the swelling and management of the condition depends on the diagnosis made.
I suggest you to consult an orthopedic surgeon for further evaluation and management.
Hope this information is helpful. Good day