The girl lives in Australia and goes inside to tan.
The following in no way endorses tanning... There are way more tanning salons than Starbucks in the Phoenix Valley, of all places, and here in Wilmington, where we have such beautiful beaches, tanning salons are profitable. Makes no sense for those who want to fake bake when the real thing is free.
Tan = burnt skin. snip
I said to her, a tan is burning
Sorry, Scarlet, but this is inaccurate. A sunburn is immediate damage to the skin, while a tan is a protective response triggered by that same sun exposure. As mentioned above, UV light is damaging--in two ways. It can cause an actual burn to the epidermis and even underlying dermis, but it can also induce mutations in living cells, particularly those that are actively dividing. The first one is acute and typically not life threatening (but can be), the latter is much more serious can be extremely lethal.
If we just look as the epidermis--the outer layer of our skin, it is many cell layers thick. In the lowest layers, cells are actively dividing, making new epidermal cells, which push the others upward. As these cells move upward, they die (a programmed cell death) and in the process fill themselves with a form of "soft" keratin ("hard" keratin makes up our fingernails). So the upper layers of cells are dead and keratinized. That's what helps make them relatively impremeable to water and other solvents. The top layer of dead cells is constantly being rubbed off, so the epidermis stays the same thickness despite the constant production of new cells from below. Down among the actively-dividing cells are pigment cells called melanocytes. These produce a pigment called melanin, which is taken up by the newly budded cells that eventually move up to the surface to be lost. This melanin gives us our skin color. Unless we are albino, we all have active melanocytes, but the different skin colors of the human "races" result from different rates of melanin production, and of deposition of that melanin in these newly-budded epidermal cells. The good news is melanin absorbs UV radiation, so it is protective. People with darker skin are better protected from UV, at least as far as the deeper layers of skin, and the underlying structures is concerned. What is a tan? It is a response of the melanocytes to UV stimulation. Under this stimulation, they increase their melanin production, so more is taken up by the epidermal cells, and abra-cadabra, we have a darkening of the skin, known as a tan. We lose a tan because without continual UV exposure, the melanin production will go back to normal (what is genetically determined) and the dead cells that contain the extra melanin will eventually be sloughed off from the surface. This is what is so dangerous about year-round tanning. To keep the tan, the body has to be continually exposed to UV. So, tanning is good in the sense it is a protective response of the body to protect cells in the lower layers of the epidermis (where cells are actively dividing), cells in the dermis, and cells of underlying structures--cells that are subject to UV-generated genetic mutations, including cancer-causing mutations.
A side note, anyone who discriminates against an individual based on the color of his/her skin is making that judgement on one simple difference--the rate of melanin production in the skin. Silly reason to treat someone differently, particularly since the person doing the judging may very well see a tan as a positive physical attribute.