Actinic keratosis: how to differentiate the good from the bad ones?
Often appearing on the face, chest, or back, these are known for their distinctive "stuck-on" look.
Only 1 study (meta-analysis) examined the percentage of malignant transformation and found a rate between 0.025% and 20% per year/ National Institutes of Health (.gov) Seborrheic keratosis - Symptoms & causes - Mayo Clinic