Findings

Blister and bullae are arranged in lines or streaks.

Impression

Allergic contact dermatitis due to exposure to poison oak.

Pathology Pointer

Contact dermatitis is a model system for cell-mediated hypersensitivity. It involves reaction of sensitized T lymphocytes to allergen (urushiol).

Preparation

Fresh

View

Clinical photograph

Specimen

Skin

Image Credit

Terence O'Grady, M.D.
Department of Medicine
School of Medicine
University of California, San Diego