BLISTER ON VAGINA? (no photo)

So earlier today I was taking a shower, debating on whether to shave or not, so I was looking around and I noticed a blister like thing near my vagina? It wasn't on the lip, it's closer to my thigh but still on my private area. 
There's no head or anything, and I'm a virgin. 
Could it be a heat rash? 

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