Wrinkles, sunspots, burns, melanomas and even cancer find out the negative effects of UV rays on your skin. Of ultraviolet emission, are 95% UVA and UVB are 5%. The UVA rays are those that reach the deep dermis causing stains, wrinkles and skin aging while UVB remain on the skin surface being responsible for redness and burns. One of the main functions of the skin is the protection of ultraviolet rays by melanin formation and thickening of the horny layer of the skin against the sun. The UVB activate the formation of new melanin getting late effect (to 3-4 days) and durable pigmentation 15 days if no more exposures as UVA oxidize the melanin get an instant effect of short period. The two types of radiation are harmful and cause effects of the sun.
Effects of the sun can produce a rash or sunburn that appears shortly after exposure. Its intensity depends on the skin type, the maximum peak at 24 hours and its duration can be 1 week if not taken over the sun. The effects of radiation are cumulative, whether repeated contact to low intensity. Wrinkles, sun spots, actinic kurtosis (precancerous) appear in sun-exposed areas like Zara, neck, hands aging skin.
At the onset of skin cancer affecting several factors: repeated exposure and sunburn (sun cancer overexposed areas), skin type (highest incidence in personas skin and eyes with poor tanning), genetics (family history of melanoma) and age (increased risk from age 40). Sunburn in childhood increase the risk of skin cancer in the adult age. The types of skin cancer are identified by the cells of the epidermis involved:
Melanomas very aggressive malignant skin cancer it is the leading cause of death among skin diseases. Your progress is rapid and occurs in the cells that produce the pigment melanocytes. The most common skin cancer is basal cell carcinoma whose origin is the abnormal growth of cells in the lowest layer of the epidermis, more often than not occurs in older people and their progress is slow. Squalors cell carcinoma occurs in the middle layer of the epidermis.