Not exactly sure what it is, but I think it could be either some kind of rot/bacterial infection. I wouldn't do anything too drastic yet (unless someone else identifies the spot as a serious problem). Monitor it carefully for signs of spreading.

Also-you didn't pot it too deep I'm hoping? If the stem is too deep in the media, there is a bigger chance of rot occurring on the stem.

In this case I use clean disposable blade and cut all affected tissue. I use cinnamon powder on the wound and carefully drench the roots with systemic fungicide, like thyomil. Another way is to seal the wound with paraphine, but it can be tricky. Another way is to use special pruning seal for cut tree brunches, you can buy in store.

This plant is potted to deep. I agree with Goldstar.

I would suggest repotting your plant or at least pot it higher. The crown is too close to the orchid mix.

You can swab the spot with some alcohol and then put some cinnamon on the spot.

It could turn into a problem. Move your plant to a bright spot after repotting. Be careful about watering. Only water when the bark is almost dry.

It appears the bark is quite large, but should work. Do not get the spot wet. Let it dry out after treating. Do not spray the plant with water.

You are in zone 7 so your weather should be warming up. Place the plant in a bright window. Keep it warm and it should respond.

Jane

The spot looks dry to me so I wouldn't be worried about it. The white residue on the leaves could be a problem, could be too much fertilizer or very hard water. The black spot could be a burn. The pot also looks like it might be too big and potted low.

There are many great YouTube channels with information on orchid growing. The American Orchid Society website also has good information.

For the correct height-the entire stem of the phal should be above the surface of the media with no leaves under the surface. It's fine to leave roots on the surface exposed to air.

It is fine for it to be growing sideways-in nature that's how they grow, hanging off the sides of trees ;P

How much light does it receive?

Orchids, for the most part, do not grow in the dirt or the ground (there are some ground orchids, but yours is not one).

Their roots have evolved to be exposed to the air and collect rain water and nutrients from the air and rain. They are not near the ground. They are not in the dirt. They grow up high in the trees with their roots exposed. The roots evolved to be exposed to the air, not sitting in a pot.

Your plant needs to be raised up higher so the roots can get air. Their roots need to get watered and dry out quickly. Think about sticking your finger in a cup of water for a few days/weeks. What will happen to your skin? Our skin needs to be exposed to air just like your orchid.

They grow clinging to the trunks of trees getting rained on and dry out quickly from wind.

That is what you have to try to copy. It is important to understand what you are growing. You need to research your orchids and learn how they grow.

Goldstar gave you good advice.

Jane