| • | AKA pigmentary demarcation lines |
| • | abrupt transition from deeply pigmented skin to much lighter pigmented skin |
| • | commonly found in people with dark skin (are normal variants) |
| • | present at birth or develop in early childhood and tend to darken with time |
| • | type A: most common, extending from upper anterior arms across the pectoral area |
| • | type B: next most common, found on posteromedial leg |
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