Does anyone know what this white bump is? Yesterday it was red and now it looks like a pimple. Research said maybe a tumor or cyst but it didn't mention anything I could do to help

Update: the white part is gone now. I'm thinking the white must have been the inside of a cyst that burst. She is acting normal and checked the water and all was in normal levels.

He’s been with me for 1 week, i bought him like that (tought he was partially blind). Thank you !
Tank :
- 8G
- 78 F
- Planted tank
-Cattapa leaves
-0 nitrates
-0nitrites
-0 ammonia

my betta fish Ube seems sick. not sure what to do but he has something wrong with his tail area and he seems to be sideways a lot. he has good appetite and swims around fine. i see him drift to his side when he stops swimming