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Average difference between melasma and healthy skin.
| Parameter | Relative difference | STD |
|---|---|---|
| Melanin | 2.06 | 0.097 |
| Epidermis thickness | 1.12 | 0.016 |
| Haemoglobin concentration | 1.18 | 0.037 |
| Oxygenated haemoglobin | 0.92 | 0.012 |
| Dermis thickness | 1.09 | 0.041 |
STD: standard deviation.
