Synopsis
Choose punch, shave or excision biopsy according to the clinical question, obtain informed consent and a representative specimen, and prevent avoidable diagnostic and procedural harm.
- Plan with the reporting question and suspected depth in mind: technique, site and orientation determine what the pathologist can assess.
- Excision with an appropriate narrow clinical margin is generally used for suspected melanoma diagnosis when feasible; avoid superficial shave sampling that truncates depth.
- Punch biopsy provides full-thickness cylindrical tissue from a selected focus, while shave biopsy samples superficial exophytic or epidermal lesions.
- Confirm identity, allergies, anticoagulants, implanted devices, pregnancy where relevant, anatomical risk, consent, specimen container and result ownership before starting.
- For Punch, shave and excision biopsy principles, describe what is seen before assigning a diagnosis, and record site, extent, symptoms, duration and change over time.
- A technically adequate result in Punch, shave and excision biopsy principles can still be misleading when the wrong lesion, site, preparation or clinical question was selected.
Key red flags
Suspected melanoma, rapidly growing squamous malignancy, uncontrolled bleeding risk, infection at the procedural site or a lesion near critical anatomy requires appropriate specialist planning rather than an improvised biopsy.
Asymmetry, evolution, nodularity, ulceration or atypical pigment should trigger a melanoma-appropriate excision or specialist pathway.
Investigation priorities
Choose a safe technique and representative target.
Management branches
The patient is stable and the result will alter diagnosis, referral or follow-up.
- Define the question for Punch, shave and excision biopsy principles, explain the process and obtain valid consent before exposing, touching, photographing or sampling skin.
- Choose representative anatomy, optimise lighting or specimen technique, and document site, morphology, symptoms and relevant previous treatment. Apply that step specifically within the punch, shave and excision biopsy principles assessment and its recorded clinical context.
- Interpret the result beside the full clinical pattern, communicate uncertainty and arrange ownership of results and safety-netting. Apply that step specifically within the punch, shave and excision biopsy principles assessment and its recorded clinical context.