Will really appreciate some help.

That's pretty normal for those when they've been cut or broken off. Although, usually they grow over. If you're in a colder climate that might slow them down. Painting a fungicide over the cut could help. Does the rest of the plant look okay?

Hi tropicbreezent!
No, we aren't in a cold climate. We reside in Mumbai, India, which is usually warm and humid. These black spots have been there for over a year (I checked old pictures of when I planted the sapling) but the spots weren't prominent back then.
I can't seem to understand what it is. It doesn't look like a stem rot because it is not squishy at all. Will the fungicide help?
The rest of the plant is okay though. Here are a few pictures. What do you think?

Yes, they were already cut when I got them last year. The black parts have grown in size now though. I hope that's not a negative indication?

It has survived two wet seasons and one dry season so far (although winters aren't cold here at all)

I agree It doesn't seem to be anything more than dead wood which has some sort of discoloration on it. Generally speaking the plant has already walled it off and recovered. But you do want to prevent moisture from sitting in it. Caulk can be used as a temporary seal but after time the caulk will shrink and then moisture gets behind it and never dries out. Best thing to do is cut and clean up as much of the dead wood to allow the plant to grow around it.

Here I removed a dead stub of a branch. I didn't cut into green area or passed the walled off area I just removed the hollowed out area to reduce the risk of trapped water.

after cutting

On this plant I wasn't able to remove any more dead wood so i cut a notch (the hand saw is resting in the notch) to permit water to drain out. This was a temporary fix as I eventually just removed the entire damaged branch to restart it below this area and cut off the tips to root.

Here is a cut branch with a temporary seal using tan caulk. eventually the seal will fail. Once it fails it is better to remove it.

Thanks a lot kms! Your response is of great help. I guess I'll try to cut off the dead wood. After cutting, is it necessary to paint it with a fungicide or something?

Will just have to figure out how to do it since I have no tools at my disposal lol

I checked out some of mine. This is where a branch was broken. You can see the bark spreading over the wound. Eventually it will cover it completely.

After making the cut, is it needed to apply a fungicide on the cut? If yes, is there an organic/home made alternative to the chemical?

Cinnamon powder is a fungicide.

Oh great! So just apply the powder on the dry cuts? Or should dampen the cuts and apply the powder so it sticks?

Should be dampened. Hydrogen peroxide is another fungicide but usually it has other chemicals added to make it more stable. People still use it for plants and seed.

Okay, I guess I'll just stick to cinnamon powder for now! Thanks for your help :)

Hey guys,
So tomorrow I'm going to cut the dead wood! I have never done this before.
I'm using this small saw which I found at my place. I hope this works? I want to make sure it is disinfected before use. Any home made options for the same? Do regular house-disinfectants like Lizol work? Or any other options?

Rubbing alcohol. The saw looks very fine tooth which may gum up and loose the ability to bite.

I would apply fungicide and if worried about what K mentioned above that the saw will not bite well enough to cause a clean cut, I would let it go and let Mother Nature work it out. It looks healthy and it’s not soft at the break point. Try and apply a fungicide or see if you can clean it out ( isopropyl alcohol) on tools and apply some sealant like Dap or waterproof wood glue. If that’s not possible, I would leave it alone !!

Good Luck!

Laura

Thanks guys. I'll leave it alone for now until I get an ideal saw to make the cut.