Will a wound heal itself or do I need to isolate seahorse?

[sugartooth]

Hello,
I just noticed what looks like a canker sore type mark on the underside of a juvie erectus tail.

She is active, eating, etc.

My question is, would this heal on it's own with good water quality or do I need to deal with this asap even though the seahorse looks and acts healthy, despite the 'canker sore' like mark.

The mark is about the size of a pinhead. (not bobby pin, a tailor's pin)

If I need to treat, would antibiotics be okay? (Furan 2 or Triple Sulfa?)

It's a 130 gal. dedicated seahorse tank. No other tankmates except cleanup crew. Temp held at 74 currently.

Thanks in advance for advice.