I've no idea - but definitely see a doctor!

It could be any number of things, it might be minor but it could also be a serious condition. It might also be a fungal or bacterial infection, in which case it might be contagious and could also spread to other parts of the body.

Get him checked!
CasperTG

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You know, Blackadder, for me socks are like sex. Tons of it about and I never seem to get any.

My Photos:
https://imgur.com/a/80hiRdm