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Good evening, I am Dr Ruff, thank you for contacting us today
I am sorry to hear this. If you have a lump that feels moveable within the skin, the most likely cause is a cyst.
Examination is what would help identify this.
I think that would be unlikely. But without examining you I cannot really advise you further. I wouldn't have even considered cancer until you had mentioned it.
Cancerous swellings are generally hard and irregular.
That is my pleasure, take care.