It may be tendonitis, Steve. But, I remember when I first started doing PK how my patellar tendon was very sore and this is not that same kind of soreness. It's a lot higher up. I mean, this is ON the kneecap itself.
Knee problems can be related to VMO or Vastis Medialis.
High levels of squatting and cleans and such can lead to a neglect for the medial muscles of the theigh...the adductors. Once the muscles get used to the eccentric contractions they undergo to counteract the work of the abductors they don't strengthen too much on their own thereafter. It can lead to pain like you are experiencing.
First thing to check out would be tracking issues. X-rays can usually reveal that...so can a good PT/Chiro (GOOD should be emphasized there). If it persists I would get it checked out before it leads to meniscus problems.