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Persistent, itchy scab vs melanoma

Two weeks ago, a skin irritation appeared on the top of my left foot. I initially thought it was a scab from some minor irritation I may not've noticed  - even though the sandals I've been wearing do not have contact with that part of the skin at all.

The fact that this scab:

- does not heal as expected
- seems to be slightly growing in diameter
- is becoming itchy

makes me wonder if this might in fact be an early melanoma, even though it does not necessarily have other melanoma characteristics such as assymetry, unevenness or multi-coloring.

Perhaps the pictures below can give a hint as to whether this is something worth having looked at by a dermatologist, or whether it is likely to be a benign scab after all.

If relevant, I am a white 38yo male, 1.80m, 70kg. Thank you for any opinions!

picture 1: https://i.stack.imgur.com/O8Kvf.jpg
picture 2: https://i.stack.imgur.com/58aIW.jpg
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3191940 tn?1447268717
If you're leaving it alone (not poking at it or picking at it) and it appears to be growing, I'd say that warrants a check-in with your doctor.  However, melanoma doesn't usually itch.  It could be another type of skin cancer: https://www.webmd.com/melanoma-skin-cancer/news/20140723/painful-itchy-patches-could-be-sign-of-skin-cancer

Your height, weight and age aren't really relevant here, but your skin type may be.  If you are relatively fair-skinned, your chances are higher of developing skin cancer.  In any case, a lesion that doesn't go away, and increases in size, merits at least a visit to your GP.
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Thank you very much!
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