Which of the following is NOT considered a benign skin lesion?

Actinic keratosis is often classified as a precancerous condition rather than a benign skin lesion. While it originates from sun-damaged skin and may initially appear as a rough, scaly patch, it carries the potential to progress to squamous cell carcinoma if left untreated. This distinguishes it from the other options listed, which are considered benign.

Lentigo, commonly known as age spots or liver spots, is a harmless increase in pigmentation and does not typically lead to skin cancer. Seborrheic keratosis is also benign, presenting as raised, wart-like growths on the skin, and is not associated with cancer. Rosacea, although a chronic inflammatory skin condition that affects the face, is not classified as a lesion in the same sense as the others but is certainly not malignant either.

In summary, while actinic keratosis poses a risk for malignancy, the other conditions listed are generally considered benign and do not present the same level of concern regarding skin cancer.