Melanoma less than 0.75mm thick rarely spreads or metastasises, whereas melanoma 0.75–1 mm thick has about 5% chance of metastasis. The risk of metastases steadily rises with thickness so that melanoma more than 4mm thick have about 40% chance of spreading.
Getting a second melanoma does not mean a poor outcome, especially if it is picked up in its early stages. In many cases, a second melanoma picked up early is thinner than the first one. If melanoma is picked up in its early stages it can be easily and successfully removed, with over 90% of people making a full recovery.
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