You are correct that herpes lesions are pretty uncommon on the scrotum, both for first outbreaks and recurrences. But even more important, if a dermatologist says the lesion doesn't look like herpes, you can rely on that - certainly that's a much more reliable judgment than I can make just by written descritpion. Finally, the quick response to steroid cream indeed supports the non-herpes diagnosis.
I suppose you are concerned about herpes simply because it's a genital lesion. But almost every one of the hundreds of things that can cause skin rashes sometimes occurs in the genital area.
Bottom line: It sounds like you have a knowledgeable dermatolgist. Follow his advice.
Regards-- HHH, MD
One more thing, I also have no other symptoms, such as flu-like symptoms, back-ache or burning urination, etc.
I doubt its herpes. I am almost positive that its probably not herpes, as im sure the doctor will tell you as well. To add, the fact that an over the counter steroid cream cleared it up in 4 days should tell you that its more likely an irritation or possibly a fungal infection. I wouldnt worry, but wait for Doctor Handsfield to reply.