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disease Disease Identification

Hi all,

I'm growing a few varieties of peppers this year, indoors. All are doing great apart from my Thai chilis. One of them, as you can see from the below pictures, looks to be doing great, the other is covered in blackened patches. The patches do not penetrate through to the bottom of the leaf, and the pepper still seems to grow, though slower than the other one. Any ideas on how to treat it? Or should I uproot it?