Does the spot feel rough on touch, and, sore or painful when fingers or clothing rub against it?
Is the size of this lesion between the size of a pencil point to that of an eraser?
Do you have a history of cumulative sun exposure?

It's definitely rough to the touch. It's not sore or painful, except when I won't stop playing around with it. If I poke and play with it, it gets sore. But I just touched it right now and there's no pain, it's just rough.

It's bigger than the sizes you mentioned. It's more like...well, I'm having a hard time explaining how big it is, but it's bigger than the size of an eraser. It's not huge but it's bigger than that.

I'm very fair skinned. For years, I didn't really leave the house that much so I thought I was pretty safe when it came to skin cancer. But when I was younger, I would go out pretty often. I always only recently started wearing sunscreen every time I went out in the summer (which wasn't a whole lot, but still)

What do you think?

Small, rough spot (flat or elevated), reddish in color (unusual shades like light, dark, pink, red or a fusion of the two), that is scaly on top, is very suggestive for actinic keratosis, or, solar keratosis.
Fair-skinned people are the ones who are at greatest risk for developing these lesions.
The main reason for its appearance is chronical sun exposure without suitable protection.
Actinic keratoses are precancerous (premalignant) lesions, meaning that they can eventually turn into a case of skin cancer (relatively few of them actually become cancers, and, the process typically takes years).
It takes many years or even decades for keratoses to develop (the predisposing sun exposure may have occurred many years ago).
Although, most commonly found in sun-exposed areas of the body such as the face, ears, and back of the hands, these lesion can also occur on the foot.

Thank you for your reply