Re: Skin cancer or keratosis
Nobody here is qualified to comment on your pictures.
You need to get it checked out by a Doctor, but it doesn't have to mean anything sinister.
I once had a mole appear on my face, grow quickly, get hard and start bleeding in the space of a month or two. When the Doctor saw it he just shrugged and said it's just one of those things. Another week later it dropped off and left no mark.
Re: Skin cancer or keratosis
Please don't add pictures.
Just take some photos and ask your doctor if you can send them to him/her to look at.