Thank you for sharing the details. Based on your description, heres a medical analysis of your symptoms to help distinguish between herpes simplex virus HSV and shingles herpes zoster Lesions appeared 4 weeks after last sexual contact compatible with primary herpes Blisters on upper thigh near genitals both HSV and shingles possible Tingling, fever, loss of appetite, and nerve symptoms occurs in both Three doctors said it looked like shingles but even experienced physicians may confuse them Too late for swab thats the only way to definitively tell during active lesions Herpes HSV-2 is more likely than shingles based on: Location near genitals Timeline post-sexual exposure Your age shingles at 31 is less common unless stress/immunocompromised Tingling and grouped blisters are more characteristic of HSV But only a swab test during active lesions or IgG/IgM testing can confirm it now