health Brownish spots and scars on leaves and stem

What are those brown patches on stems and leaves? Those on stems look like brown scars. I thought this is some kind of fungus so I sprayed my plants with sodium bicarbonate and soap and next time with peroxide. Its still there:
 
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Looks like some type of fungus. I'm not familiar with the tratment you applied.
I know sulfur dust also is great prior to a fungus break out.
 
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