What Causes Wet Sensation In Thighs?

I am a very healthy and active 40 year old woman but lately my thigh feels wet but is dry. Probably three to four times a week. Often when exercising. I do have hypothyroidism. Is this a reason to check my levels to see if meds need to be increased? I had them checked three months ago and all was ok. This leg wetness has been just the last few weeks. Thx