Wondering what this is and how I can resolve it, this is also causing new budding sites to turn brown. What could it be, ironically this appeared after an application of neem oil which I was using to prevent things like this. Never had this problem before.
looks like burns from the neem I would guess. Did you have the lights on? the oils could magnify the lighting possibly, or the material could have concentrated in those areas and burned the tissue.
If it doesn't let up, then consider phosphate deficiency, but really, do you think if I apply x compound and its followed by a burn, that the compound (neem or soap) could have caused the distress?