Histology of previous (pre)cancerous lesions in 32 patients
| (Pre)cancerous lesion | No of cases |
| Basal cell carcinoma | 12 |
| Squamous cell carcinoma | |
| Head and neck | 4 |
| Body | 7 |
| In situ carcinoma | 7 |
| Actinic keratosis | 4 |
| Bowen carcinoma | 1 |
| Cutaneous B-cell-lymphoma | 1 |
| Solar elastosis | 1 |
| Keratoacanthoma | 1 |