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I'm Dr Chip
Could you please post a photo for me on this page?
And you say this just suddenly popped up?
Nothing too worrisome here--
It's not any kind of cancer--not a melanoma or a basal or squamous cell carcinoma
Those don't suddenly pop up like that
It's a small totally benign keratosis--fairly common in many people
It may go away on it's own but if it bothers you it can easily be removed with a cold CO2 laser by a dermatologist
Please let me know if you need any more information
Could be just irritation from what you were wearing but again nothing to worry about