Okay, let's tackle this question about the first symptom of vulval cancer. First, I need to recall what I know about vulval cancer. The vulva includes the external genitalia in females, right? So, symptoms would be related to that area.

The question is asking for the first symptom. Common symptoms of vulval cancer might include itching, a lump, or a sore. But which one comes first? I think persistent itching (pruritus) is a common early sign. Maybe because the cancer can cause irritation or changes in the skin. I've heard that vulval intraepithelial neoplasia (VIN) can present with itching before progressing to invasive cancer. So maybe pruritus is the initial symptom.

Let me check the options again. The user didn't list the options, but typical distractors might be things like pain, a visible lump, or bleeding. So if the correct answer is pruritus, then the other options are incorrect because they come later or are less common. For example, pain might develop later due to infection or spread. A lump is a physical finding that might be noticed after the itching. Bleeding could occur if there's a lesion that's ulcerated or traumatized.

Wait, but I need to make sure. Some sources might mention a painless ulcer or mass as a presenting symptom. But I think pruritus is often the earliest. Also, VIN is a precursor that's associated with itching. So the first symptom is likely pruritus. The other options are either later symptoms or not as commonly the first.

In terms of clinical pearl, maybe stress that persistent vulval itching should prompt investigation for VIN or cancer, especially in older women. That's a high-yield point for exams. Also, remember that VIN is a precursor and can progress to invasive cancer if untreated.

So putting it all together, the core concept is about the initial presentation of vulval cancer. The correct answer is pruritus. The incorrect options are pain, lump, or bleeding, which are later signs. The clinical pearl is to consider vulval cancer in cases of persistent itching, especially with risk factors like HPV infection.

**Core Concept**
Vulval cancer, a malignancy of the external female genitalia, often presents with early symptoms related to cutaneous changes. Pruritus (itching) is the most common initial symptom due to associated vulval intraepithelial neoplasia (VIN), a precursor lesion.

**Why the Correct Answer is Right**
Persistent vulval pruritus is the hallmark first symptom in many cases of vulval cancer. VIN, a premalignant condition, frequently manifests as chronic itching before progressing to invasive cancer. This is linked to human papillomavirus (HPV) infection in high-risk cases, which induces dysplastic changes and inflammatory irritation.

**Why Each Wrong Option is Incorrect**
**Option A:** Pain is typically a late symptom due to advanced disease, nerve invasion, or secondary infection.
**Option B:** A visible mass or ulcer is a later physical finding, not the first symptom.
**Option C:** Bleeding occurs in advanced stages when lesions are ulcerated or traumatized.

**Clinical Pearl / High-Yield Fact**
Never ignore persistent vulval pruritus lasting >4 weeks, especially in women over 50 or with HPV risk factors. Biopsy of suspicious lesions

✓ Correct Answer: B. Pruritis