Overview

Genital blisters are fluid-filled lesions that may be caused by herpes, dermatitis herpetiformis-like reactions or other skin conditions. Clustered blisters often suggest herpes but require confirmation.

Possible causes

  • Herpes simplex
  • Contact dermatitis
  • Other vesicular conditions

What to note before assessment

  • Avoid breaking blisters
  • Note prodrome symptoms
  • Seek assessment during active lesion if possible

Key points

  • Clustered blisters suggest herpes
  • May precede ulcers
  • Swab during lesion helps
  • Other skin causes exist

When to seek care

  • New clustered blisters
  • Blisters with pain or itching
  • Recurring episodes