• Too much pressure in the soft middle bit of your undercarriage.

    Try: tilting the seat back, forwards, angle the front slight to one side, moving it fore/aft, slotted saddles, etc. In that order basically.

    The pressure should be on the sit bones (the boney bits in your arse) not on the soft perineum between sack and sphincter.

    Also, stand up every now and then to relieve the pressure. What saddle are you using? Is your bike fit good/are you generally comfy?

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