Based on your description and observing that the lesion is grouped, red, and fluid-filled, this could likely represent herpetic dermatitis (such as Herpes zoster) or an irritant vesiculobullous dermatitis. The pain and itching suggest a neural or inflammatory component.
Next Steps
An online consultation with a dermatologist is strongly advised to confirm the diagnosis and begin timely antiviral or anti-inflammatory therapy if needed. Early intervention can prevent complications and scarring.
Health Tips
Avoid scratching or bursting the blisters as it can lead to secondary bacterial infection. Do not apply home remedies or steroid creams without guidance. Keep the area clean, dry, and covered lightly.