Uva Uvb Radiation Penetrate 640074304

Tags: sunlight sun protection skin cell rays aging cancer blemish pigment ultraviolet radiation tanned wrinkle damage dermatology sunburn dna uva freckle affect premature penetrate aesthetic sunblock wavelength epidermis dermis melanin pigmentation sunscreen collagen uvb hyperpigmentation infographic laye skin cancer vitamin D melanocyte melasma elastin skin layer melanogenesis