sundamaged forehead closeup of actinic keratosis understanding rough scaly skin patches and early sun damage detection

wrinkles understanding treatment topical sunscreen sundamaged sun strong squamous spots skin signs signal showcases scaly rough rash raised protective protection problems preventative precancerous photographic patches notice medical linked lesions keratosis hyperpigmentation health forehead exposure excessive early dry discoloration develop detection dermatology dermatologist damage cryotherapy crusted cosmetics condition common clothing closeup check