There may be two possibility either you dont have fungal infection or the doses of flucaz you are taking is inadequate. Rashes on thigh is most commonly fungal infections but sometimes they could be other things. I suggest you to first consult your dermatologist and get a diagnosis then it would be vrry easy to treat you. Alternatively you can start applying sercos cream twice daily and see the response in next 2 weeks. Warm wishes Dr Prakash Khute