He is completely unconcerned about it and I am probably being silly but I want to insist he sees the GP because this patch of discoloured skin was about quarter of a centimetre in size for as long as I've known him.
Over the last 2 months it seems to be getting bigger and it's now closer to 3cm. It looks very strange to me but he rolls his eyes whenever I mention it, but it's bothering me. Apparently isn't painful and doesn't itch.