Mole by husband's crotch

Sorry I know this app is for women but I need some opinions! My husband has a dark browninsh fairly big mole in between his leg & crotch (like in the crease of his leg) he got it checked out a few years back & the doctor mentioned removing it (just because) & he refused... do you think he should get it checked again? I'm just worried a little cause his cousin has testicular cancer... can moles change just within a few years? Thank you in advance!

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