It's probably sunburn. Ease back on the full sun exposure or you'll have lots of scarring on your leaves. Plants need to be eased into sunlight, especially if they've been indoors all winter.

All right, it was in full sun but two days ago I moved it to part sun part shade. Could it be from the sun two days ago just barely showing now?

The purple on the stems is just from being in brighter light, and that's not a bad thing. I just see a few marks on the newer leaves that look like it could be sun damage (it could be damage from something else, but better to be careful). This plant should be able to get to full sun with no problem, but maybe be more gradual.

Ok will do, this is day 5 outside and it's cloudy today so that should help. The new leafs were turning black a week ago. Is that from too much water and not enough sun?