| Widespread redness | Localised red patches |
| • Candidiasis | • Candidiasis |
| • Iron deficiency | • Erythroplasia |
| • Avitaminosis B | • Purpura |
| • Irradiation mucositis | • Telangiectases |
| • Lichen planus | • Angiomas |
| • Mucosal atrophy | • Kaposi's sarcoma |
| • Polycythaemia | • Burns |
| • Lichen planus | |
| • Lupus erythematosus | |
| • Avitaminosis | |
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