Mary noticed a large, brown spot on her skin. She has been playing tennis in the sun for several years without sun protection
She reported the discovery to a friend, who told her to apply the ABCD rule to determine whether or not she had malignant melanoma. Her friend told her that if her answer was "no" to the questions that were asked by the ABCD rule, she had nothing to worry about. What is the ABCD rule and should she ignore the spot if her answers are negative?
What will be an ideal response
The ABCD rule refers to the following: asymmetry—where the two sides of the spot do not match; border irregularity—the borders are not round and smooth; color—the pigmented spot contains shades of black, brown, tan, and sometimes blues and reds; and diameter—the spot is larger than 6 mm in diameter. It is imperative that Mary have a physician examine the spot immediately. Any unusual lesion on the skin of a sun worshipper should be examined and the ABCD rule does not account for all possible factors, such as rapid growth, even if less than 6 mm.
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