Slightly Inflamed And Itching On Right Side Of Glans

41-year-old circumcised male, one sex partner for past 15 years. The last few months i've had slight itching on the right side of my glans, which now appears slightly inflamed. It's on the corona, the inflammation probably about 10 mm long. My dermatologist briefly looked at it and said it was caused by friction. he prescribed a cortisone cream and said it could take up to two weeks for relief.

it's been several days and the inflammation seems to be only worse. I am highly stressed about it and wonder if i'm making it worse. I read online that irritation and itching are commonly present near the onset of penile cancer, which of course makes me even more anxious and is perhaps making the problem worse. Is there any way to tell for sure what this is or, more importantly, is not? I think mental relief would go a long way toward resolution.