The typical signs and symptoms of a melanoma are - ' Asymmetrical skin lesion, irregular border of the lesion, multiple colours, moles greater than 5 mm are more likely to be melanomas than smaller moles, change of a mole or lesion may be a hint that the lesion is becoming malignant or elevation.'
You could read more about the condition at the following link -
' http://en.wikipedia.org/wiki/Melanoma'
Nothing can be said with surety without having a look at the leions and it would be best to consult your doctor for a clinical examination.
Let us know about what your doctor advises and post us if you need any other information.