| What to compare | Mature hairline | Possible recession |
|---|---|---|
| Pattern over time | Little meaningful movement across comparable photos | Corners or front edge continue moving backward |
| Temple shape | May have a gentle, stable corner | Corners may deepen progressively |
| Symmetry | Can be symmetrical or naturally uneven | May progress evenly or more on one side |
| Density | Often looks consistent behind the outline | May look reduced around corners or frontal zone |
| Age | Often noticed as an adult outline develops | Can begin at different ages; age alone cannot classify it |
The most useful test is time
Take the same front and temple views, then compare after a meaningful interval. If framing, lighting or hair length changed, lower your confidence in the comparison rather than forcing a conclusion.
Why shape is not a diagnosis
Visible recession can occur in hereditary pattern loss, but appearance alone does not establish the cause. Hair loss has multiple causes and a clinician considers history, symptoms and scalp findings. [source]
A practical comparison
Sources
- Hair loss: Who gets and causes. American Academy of Dermatology, 2024.
- A practical guide to the standardization of hair loss photography for clinicians. Clinical and Experimental Dermatology, 2024.