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This does not sound like herpes. Herpes does not come and go as rapidly as you have noted your blisters to. This sounds like a sweat rash or contact dermatitis. In contact dermatitis, the rash may present with blisters and they may be associated with redness in the area. I suggest that you wear loose cotton material for pajamas or underpants. Try to avoid placing a pillow between your legs if this appears to trigger this.
Wash the area with a mild cleanser like Cetaphil. This should revert spontaneously given time.