Muscle knots in the Flexor Carpi Ulnaris feel a deep, nagging ache along the inside edge of your forearm, right down to the pinky side of your wrist. You’ll notice the discomfort especially when you try to bend your wrist forward and to the side, like scooping something or typing for a long time. This is the kind of tight spot that can even make the whole little finger side of your hand feel a bit weak or strange.