Are there any treatments or lotions, ointments that can make my dark knees (theyre not that dark at all but a little) to go away? im only 5:3" & 143lbs. so is there anything that will get rid of them?

Depends: If the darkening is because of increased pigment then otc fading creams may help. If the darkening is just from thickening, which can be common on the knees and elbows, then a "keratolytic" may help. This is something like salicylic acid or urea that will help soften the area. Seeing a dermatologist would also be helpful as he/she could also prescribe something for you.