Both Rosy Barbs acting strange!

The female appears to be fat with eggs.

The male looks like he might have an external bacterial infection.
How long did the lump take to appear?
Did you add anything to the tank in the last week or two?

You can try salt (1-2 heaped tablespoons of rock salt per 20 litres of water). If there's no improvement after 24 hours with salt, then you will probably need a broad spectrum medication that treat protozoa, bacteria and fungus. But try salt first.

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SALT
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, Bettas & gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.

The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.

After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.

If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.

When you first add salt, add the salt to a small bucket of tank water and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.
 
Female barbs need a tank with plants and a male to chase them around and breed with. Just leave the female in the tank with the male.

When I asked if you added anything to the tank in the last 2 weeks, I meant fish, plants, shrimp or snails. Something that might have introduced a disease.
 

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