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Can you upload a picture?
Does this itch, hurt or burn?
Were you exposed to plants or any new foods the day prior?
The swelling appears to be consistent with what we call "angioedema" which is from increased vascular permeability (leakage of serum fluid). It is usually in response to an allergen. So, for example, poison oak or ivy will often swell like this, sometimes with a bubbling of the skin and oozing of clear or slightly yellowish fluid. The only difference is that it typically itches a lot.
Similary, a new food that you are allergic to may have touched your chin the day before and set this in motion.
Another possibility would be an insect bite. Some bugs secrete a tiny amount of saliva (i.e. enzymes) that can precipitate local swelling, sometimes without itch.
Neosporin might clear any topical bacteria but doesn't penetrate the skin too well. An antihistamine like benedryl or zyrtec would dampen any allergic response that is leading to the swelling.
Similarly, ice can be very effective.
I was going to mention that shingles can also present like this (particularly the one-sidedness of it). This virus is in the herpes family and can result in swelling and tiny bubbles (clear fluid) where it emerges near the end of the nerve fiber. It usually is very painful however.
Herpes 1 (oral) and herpes 2 (genital) can infect the skin if there is a break in the skin and it comes into direct contact with the virus. This would not hurt the way shingles (herpes zoster) does.
Are those tiny bubbles (vesicles) near the tip of the swelling?
Any swelling of the lips or tongue after eating the fish?
Did you cut yourself shaving there?
I think the neosporin, ice and zyrtec are a good idea for "first aid" purposes. If the swelling does not come down over the next 24 hours, particularly if there is increased redness or additional drainage, you should have it examined. A bacterial infection might be brewing regardless of the original cause. This might not improve without oral antibiotics.
Zyrtec (ceterizine) and claritin (loratadine) are second-generation antihistimines available OTC.
Benedryl and chlorpheniramine are first-gen and are more associated with drowsiness.
You're welcome. Hope all works out for the best.
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That's certainly possible as the reaction to a bite can be exuberant, though usually there is some redness and itch. This typically resolves slowly over the course of several days to a week. If it starts to look infected (e.g. increased redness, warmth, pain, discharge) or you develop fever, have it looked at right away.
I would stay away from that...not likely to help, but may irritate.