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Patient and Observer Scar Assessment Scale (two 6-item scales).
Rated by the clinician (1 = normal skin, 10 = worst scar).
6/60
Rated by the patient (1 = as normal skin, 10 = worst imaginable).
6/60
Each item is scored 1–10; the two scales are reported separately (each 6–60). POSAS also includes an overall opinion item not scored here. Education only.
POSAS captures both the clinician's and the patient's view of a scar across six items each, scored 1 (normal skin) to 10 (worst scar). It is a validated, responsive tool for tracking scars and comparing treatments.
The observer rates vascularity, pigmentation, thickness, relief, pliability and surface area; the patient rates pain, itch, colour, stiffness, thickness and irregularity. Each scale totals 6–60 and is reported separately.
Unlike the clinician-only Vancouver Scar Scale, POSAS adds the patient's perspective and is generally more sensitive to change — useful in scar research and follow-up.
Education only — a clinical assessment tool, not a treatment decision in itself.