Knee injuries/discomfort is probably the most common complaint we hear on BF. It's endemic to cycling because of the repetitive nature of a very particular movement which becomes trained into our muscles even though it's not optimal.
You never did say where the pain was. One one post you said below the knee, on another you said above. You didn't say which knee, left or right. The inside and outside words are medial and lateral:
A lateral orientation is a position away from the midline of the body. For instance, the arms are lateral to the chest, and the ears are lateral to the head. A medial orientation is a position toward the midline of the body. An example of medial orientation is the eyes, which are medial to the ears on the head.
You almost certainly have a muscular imbalance, which is causing the knee cap to move to a position where it abrades rather than being cushioned by cartilage. That's what CP is. The muscular imbalance is caused by cycling with an unbalanced muscular contraction for some reason. PT can fix it. That said, the rule for pain in front of the knee is to take a couple days off, then raise the saddle say 5-10 mm, then pedal only Z1 for 30' for a week or so and only if there's no pain. I'd say do that after some PT.
Here's an old post on that subject:
https://www.bikeforums.net/training-...l#post16081392
But read the whole 73 post thread, worth it.