keratosis
Medical term for abnormal thickening of the skin's outer layer.
日光角化症は、紫外線が原因で起こることが多い。
Actinic keratosis is often caused by ultraviolet rays.
actinic keratosis; solar keratosis
keratosis pilaris; follicular keratosis
Compound of 角化 (keratinization) and 症 (condition/disease).