That doesn't look like sunburn to me. Sunburn usually puts a whitish-silvery sheen over a broad area of the leaf, then gradually withers or just stays the same.

No idea what you have. It looks kind of like the damage you get after spraying a leaf with Safer's soap to control aphids.

I haven't sprayed anything on it. All the leaves have lots of black spots on them. Looks kinda like dirt splattering from watering, except it isn't. Even new leaves have it. :(

have you possibly overdosed with fertilizer? I know it can leave burns that look similar to that.
Pam

I guess that's possible, although not very likely. I have only given it fertilizer twice I think. And I've not given it any more fertilizer than any of my other plants, and this is the biggest one. However, the bigger pot probably caused it to absorb more fertilizer.

Is there a fix? Wash out the soil? Wait?

Tomorrow I'm going to take out my watering wand and drench my plants (I'm thinking I over fertilized mine - not all are having problems, but some are) - I'm waiting until it warms up so they won't get waterlogged.
Pam

That plant looks fine to me. Try not to overthink these things. I would be more concerned about overwatering. Why do you have aluminum foil around the bottom of the pots? Plants need air as well as water and food.

The foil sits loosely around the pot. It's there to keep my house relatively dirt free :) I guess I am over thinking things. Thanks!

I think your plant is fine. Sun burn or sun damage comes in many different forms. I burned leaves plenty of times my first two seasons. I had a habanero leaves burn brown, two Bhuts burned white and a few other a silver sheen. Thats when i found out dont harden off in mid-afternoon sun lol, i now harden off with the morning sun it works out better. So it could be slight sun burn or not but at this point if its not getting worse would not worry.

Mark

The plant definitely is not fine. The new foliage at the top stopped growing entirely, and turned spotty black and wrinkled. I figured I could try pruning the plant to see if it would branch out lower. Well, two weeks later the plant looks pretty much the same. Just noticed one of its few remaining leaves have fallen off. Will probably can the plant. It's my first to die, and I have many, but I'm still curious what happened to it...

So sorry to hear your story. I'm wondering now if it might have been some kind of fungus, like possibly sooty mold. Just in case it's contagious, you should probably throw away the potting mix it was in and clean the pot well before using it again. Have any of your other plants shown similar symptoms?

Nothing similar anywhere. As this is the only plant I've put in this size container, my only remaining suspicion is that it may have gotten soggy feet. If so I guess I should find some rotten roots, so I'll perform an autopsy soon.

I do not think that is sunburned. Within a few hours I know my plants got sunburned. The color of the leaves may different as other posters mentioned. The tender leaves usually pale/silver/whitish/transparent and old leaves sometimes looks a bit brown. Even in the shaded place I should not put my seedlings long time but I put very long time as a result I lost many healthy plants. As much as possible the shortest time in the shaded area is the best. Once it burned then there is no solution. The plant may die or have to wait many days/weeks for new leaves.

Partially sunburned leaves:

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I had similar problems like yours. I did not get any solution and I think it was soil and nutrients related. When the soil are too dry then the nutrients are locked cause so many problems to the plants. When the bottom soils are dried and the upper are wet the plants do not die but the plant may have many problems.

The discoloration of the leaves like yours won't kill the plants.

Caelian

The plant finally caved today. I kept it around for quite some time. It started putting on some new growth, and I originally picked all the original leaves. The new growth looked great, so I was kinda excited. Then a sudden draft sent it smashing to the floor, and the stem broke, leaving the plant with no leaves at all. So that was it. Took a look at the root ball, and it was nice and big, so it doesn't seem like there was really anything wrong with the plant.

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I bet you it would grow back.

I wouldn't be surprised, but honestly I could use the pot for another plant, and I still have more or less too many, so that was it :)