Dermatology Actinic Keratosis Mc benign lesion with malignant potential Caused by chronic sun exposure Review of actinic keratosis. Part I: etiology, epidemiology and clinical presentation Epidemiology of actinic keratoses and squamous cell carcinoma Precursor lesion to SCC Up to 60% of cutaneous SCCs arise from preexisting AKs Cutaneous Tumors Systematic skin cancer screening in Northern Germany Early diagnosis of cutaneous melanoma: revisiting the ABCD criteria Biopsy for malignant melanoma--are we following the guidelines?