Please do as scottma advised. Melanoma is very rare in children, and as he said, can be very fast growing. An oral surgeon is your best friend. He can check it out and determine if it is or is not a melanoma.
Try not to read too much information on the internet as most is geared toward adults, but it is VERY important that you seek GOOD medical advice.
Best to you and your daughter,
Gellia
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Melanoma is extremely rare occuring in children. Melanoma tends to be growing fast, irregular border, indurated consistency, very dark shade. Seeing an oral surgeon is advised.