{'fraction_non_alphanumeric': 0.0210896309314587, 'fraction_numerical': 0.0017574692442882249, 'mean_word_length': 5.195652173913044, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Photoaging of a skin].

Photoaging is a skin aging caused by long-term exposure to the ultraviolet radiations of the sun. Ultraviolet activates activating protein-1 and generate reactive oxygen species which play a substantial role in collagen degradation. Clinically, photoaged skin appears as a coarse with deep wrinkles. Presently there are available several agents to reverse the photodamage. There is conclusive evidence that synthetic vitamin A derivatives are the most effective in the treatment of photoaging. Erythema and scaling may be experienced initially.