Blister? HELP?

Today I noticed a sore spot on my inner thigh/butt cheek. I had a look and it's a large blister, the same as when shoes rub and the top is gone. I've been with my partner 9 years and had a full health check 2 months ago, so it's nothing nasty I hope. Just wondering if anyone has had this? Hoping it's just from friction? 

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