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Don't get too worried, especially if the pup is otherwise healthy. People and dogs both get odd little lumps on the skin from time to time. Have your vet check it out, and if you're concerned at all, it can be removed for biopsy.
A benign growth is infinitely more likely than the scary possibility. If it continues to grow, you can push your vet to take it off and send it out for a biopsy.