What are the three main types of skin cancer? How are they different? Discuss how you can prevent too much exposure to ultraviolet radiation.

Question

Fill in the blank(s) with the appropriate word(s).

Answer 1

1. Basal cell carcinoma. Basal cells form the base, or the innermost layer of the epidermis.2. Squamous cell carcinoma. Squamous originates from the word "scale." These flatter cells form the outside layer of the epidermis and shed as new cells form.3. Malignant melanoma. Melanoma originates in cells that create melanin, which gives color to skin.Sun lamps and tanning parlors provide mainly ultraviolet A (UVA) rays. Once thought safe, they, too, are now known to be damaging and have been linked to melanoma. Sunscreen lotion should be applied about 30 minutes before lengthy exposure to the sun because the skin takes that long to absorb the protective ingredients. Choose sunscreens labeled broad-spectrum because these products block both UVA and UVB rays. A sun protection factor (SPF) of at least 15 is recommended. During peak hours, reapplication is vital. For face protection on an average day, it is probably most realistic for most people to apply sunscreen in the morning and then wear a protective hat when outdoors during the day. When swimming or sweating especially, reapply waterproof sunscreens more often because all sunscreens lose strength when diluted. If one is out in the sun for a lengthy period, wearing protective clothing is even better than sunscreen: long-sleeved shirts, long pants, and a hat with a 2- to 3-inch brim all the way around.