Not itchy red dry patch, on leg, it's not a perfect circle but roundish. no pus or other colors, didn't even notice it until someone pointed it out. ?

See Your Doctor: There are several possible causes for the skin findings you have described ranging from Eczema, Fungal Infection, a manifestation of a related medical disorder, and more. Moreover, diagnosis will be challenging without visual inspection; your medical history (recent/past) is needed to provide important diagnostic clues as well. Suggest you see your doctor for proper diagnosis and treatment.