Muscle knots in the Triceps Brachii are commonly found along the back of the upper arm. These muscle knots can refer pain not only to the back of the shoulder and forearm, but also to the front of the elbow, and even extend into the ring and pinky fingers, often mimicking nerve-related discomfort. You may feel aching, tingling, or weakness during activities like pushing, lifting, or leaning on your elbows.