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The fact that the pitting is visible on the inside of your shins is because the bone is more prominent on the front and inner side of the shin against which the oedema is visible more clearly. The cause of the oedema needs proper investigation. Have you done ultrasound
abdomen pelvis, liver
function tests, kidney
function tests. Do you have any skin rash
. If you are overweight
you need to lose weight otherwise sleep apnoea will not be relieved. Which tests have you done till now, could you provide information then we are in a better position to help.