The margin is a distinctive purple colour.
The margin is oedematous and has a cyanotic purple colour. The central area is eroded.
The margin has a lilac colour which contrasts with the rest of the lesion which is tethered and sclerotic.
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| Annular lichen planus: The margin is a distinctive purple colour. |
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| Pyoderma gangrenosum: The margin is oedematous and has a cyanotic purple colour. The central area is eroded. |
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| Morphoea: The margin has a lilac colour which contrasts with the rest of the lesion which is tethered and sclerotic. |