Danios Have Strange Red Lump On Stomachs

[Shmicklet]

This is very strange,

I have a total of 5 danios, and 2 of them have strange red lumps on their stomachs. I think they are both male, as they have always been way thinner than a few of my other danios. I don't know what they could be from and must have apeared very radily because I check my fish daily and failed to notice anything before tonight. Could these be from worms? I saw little white worms swimming in the water and then my baby guppies ate them about two days ago, but I haven't added any fish since july. I lost only a guppy a few days ago, but she was old, and blind, and was deteriorating since september. Please look at the photos and tell me what you think. I appologize if they don't show up, I haven't added photos to this site before.

Thank you!

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

Being thin can be old age, not feeding enough, fish tb, to internal parasites, external parasites.

Signs of internal parasites are.
long stringy white poo or clear mucas poo.
Being thin or bloated.
Enlarged anus or red inflamed anus.
Sunken in belly.
Bent spines sometimes.

Red lumps can be bacterial to parasites.
Any sgins of flicking and rubbing.
Any excess mucas on the fish body.

Lumps that suddenly appear are usually bacterial.
Any white around the edges of the lump or a white centre.
Do the lumps look hard or soft like filled with fluid.

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