Depends..: There are actually different types of melanoma. The most important thing that predicts how dangerous a melanoma will be is the depth of its growth in the skin. Never shave a lesion which might be a melanoma. It needs to be biopsied by a doctors knowledgable in skin cancers. www.melanomafoundation.org.
Answered 9/28/2016
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Immediately: Malignant melanoma begins to spread immediately. Hence the name malignant.
Answered 8/6/2013
6.2k views
Varies: Different melanoma grow at different speeds. It is very hard to predict their growth rate.
Answered 12/10/2013
5.2k views
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