Question

A patient presents with painful vesicles in the genital region. Identify the lesion shown in the image and choose the correct diagnosis. 

• A. Herpes
• B. Chancroid
• C. Syphilis
• D. Candidiasis

Hint:

For painful genital vesicles, think of herpes simplex virus. If the vesicles are grouped and painful, it's highly suggestive of HSV infection.

Answer 1

The Correct Option is A

Step 1: Pick the one discriminating word.
For a genital ulcer/vesicle question, the single most decisive feature is whether the lesion is painful or painless and whether it is a group of vesicles or a solitary ulcer. Here the stem says painful vesicles - lead with that.

Step 2: Match the morphology.
Clustered painful vesicles on an erythematous base that later erode into shallow tender ulcers are the signature of genital herpes simplex virus (HSV-2 > HSV-1). Recurrence, prodromal tingling and tender inguinal nodes support it.

Step 3: Eliminate using the 'painful vs painless' and 'vesicle vs ulcer' grid.
• Syphilis - primary lesion is a single painless, indurated, clean-based chancre ($\textit{Treponema pallidum}$); never grouped vesicles.
• Chancroid - painful, but it is a ragged necrotic ulcer with undermined edges and tender suppurative buboes ($\textit{Haemophilus ducreyi}$), not vesicles.
• Candidiasis - pruritic erythema with curdy white discharge/plaques, no true vesicles.

Step 4: Conclude.
Only herpes gives painful grouped vesicles; the morphology in the image fits HSV.

Final Answer: Option 1 - Herpes.