From the symptom you describe, herpes would not seem the most likely cause, and herpes would not last more or less unchanged for 2 weeks. However, since your husband has genital herpes, it has to be considered a possibilty. A traumatic lesion or yeast also sound like possibilities. Or, as you say, some other sort of irritation.
Bottom line: Most likely your lesion isn't herpes, but I cannot tell any more than you have figured out yourself. The way to sort this out is to see a health care provider. Even if s/he agrees the lesion itself isn't herpes, you should have a blood test for HSV-2. That's the only way to know whether you acquired your husband's infection somewhere along the line. If you did, you are at risk of transmitting the infection to future sex partners, whether or not your current problem is herpes, and whether or not you have symptomatic outbreaks of herpes.
Good luck-- HHH, MD
I too want to ask this forum Doctor similar questions. Like I said in my other post see a doctor and ask for a Herpes Select, type specific test or Western Blot to be sure. I want to figure out how to and ask the Doc some questions myself. Goodluck!! EB