actinic keratosis

n.an overgrowth of skin layers resulting from extended exposure to the sun

1. Actinic keratosis can be a precursor to skin cancer if left untreated.
   如果不加治疗，光化性角化病可能会发展为皮肤癌。
2. The dermatologist recommended using sunscreen to prevent actinic keratoses.
   皮肤科医生建议使用防晒霜以预防光化性角化病。