Hi there,
if its a single spot, I wouldnt worry too much.
Just keep an eye on it.
It possibly....(not for sure) could be a cist, or a tumor,
or a wound. Give it time to clear up or get worse so you
can determine what it is.
Have you been monitoring your Ammonia levels to keep
track of where your cycle is at?
Have you been doing water changes?
Adding prime?
Check the decor in the tank, all plants and decorations, feel all over
for any rough edges or rough spots. Bettas are very curious,
and often wound themselves through trying to squeeze in small spots,
or hide, or just cuz of curiousity for curiousity sake.
Its likely a small scrape or missing scale.
If it worsens, keep me posted and I will see what we can deduce.
Of course, a Picture is always helpful too!
Feel free to post one asap so I can have a look.
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