I could see some water retention from suntanning.
The skin is damaged from the UV rays. Fluids are moved to the skin, to help heal.
as taken from here
Tanning Truth » Blog Archive » Indoor Tanning: Smart Tan
But What About Skin Cancer?
There arguably is more misinformation about skin cancer than any other form of cancer, and most of it involves distorting the nature of skin cancer???s complex relationship with sun exposure. Consider:
Melanoma skin cancer is most common in people who work indoors ??? not in those who work outdoors.
Melanoma skin cancer occurs most often on parts of the body that are not regularly exposed to the sun.
18 of 22 studies examining melanoma and indoor tanning have shown no statistically significant association, including the most recent and largest study, which showed no connection at all. The four older studies that alleged a connection did not adequately control for important confounding variables such as the subjects??? outdoor exposure to sunlight, childhood sunburns, type of tanning equipment utilized (many of which were unsupervised home units) and duration and quantity of exposures.
Melanoma mortality rates in the United States are not rising among young women, but are increasing dramatically among older men, according to National Cancer Institute data. (In Canada, melanoma rates for women under 50 have actually declined in the past 20 years). Yet the majority of the marketing message about this disease is directed at young women, who are the highest consumers of dermatological services.
The photobiology research community has determined that most skin cancers are most likely related to a strong pattern of burning and intermittent sun exposure in those people who are genetically predisposed to skin cancer and not simply to cumulative exposure. That suggests that a pattern of repeated sunburning is what we need to prevent. And that kind of prevention is exactly what the indoor tanning industry is doing effectively.
Skin cancer generally has a 20- to 30-year latency period. The rates of skin cancer we are seeing today in older individuals mostly are a function of the ignorant misbehavior of the 1970s and early 1980s. Recall: Society used to view sunburns as an inconvenient right of spring, or as a ???precursor??? to developing a summer tan. Severe burns were commonplace. Today we know how reckless that approach was, and the incidence rates of skin cancer today in those over 50 years of age reflect that ignorance.
The indoor tanning industry believes that our role in teaching sunburn prevention will help to reverse the increases that largely are a result of misbehavior that took place years ago before the professional tanning industry existed and before we were organized to teach sunburn prevention.