That sounds like a pretty classic case of chafing from a saddle that is too pear shaped for your particular anatomy.
As your hip joint flexes and extends the pear-shaped transition from "sit" to "nose" gets in the way and rubs.
Usually chafing in the creases where the butt meets the leg.



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I have been having problems with chafing in between the inner thighs and I strongly believe my saddle isn't right for my shape. This past week I did get a narrower shaped saddle with a 30 days satisfication guarantee. Going to try it out tomorrow on the trails.