From the photo, the swelling looks like a localized gum infection or gum abscess on the lower front gums. The bright red swollen bump suggests inflammation, and it may be caused by:

• trapped food/bacteria
• tartar buildup
• gum trauma
• infected tooth root nearby
• periodontal infection

It does not look normal simple irritation anymore.

What you should do now:

1. Continue Betadine gargle, but only:

• 30–60 seconds
• 2–3x daily maximum

2. Start warm saltwater rinses

• This is very important for swelling
• Warm water + 1/2 tsp salt
• Gentle rinse every few hours

3. Brush gently around the area

• Use soft toothbrush
• Do not scrub hard
• Keep the area clean

4. Avoid:

• smoking
• alcohol
• spicy food
• very hot drinks
• poking the swollen area

5. Cold compress outside the lip

• 10–15 minutes
• helps reduce swelling

6. Watch for these danger signs:

• pus
• fever
• facial swelling
• throbbing tooth pain
• swelling spreading
• difficulty swallowing

If any of these happen, you should see a dentist urgently because antibiotics or drainage may be needed.

Based on the image, I strongly recommend a dental check within a few days if swelling does not improve. Gum abscesses sometimes improve temporarily with gargle but return because the source of infection remains under the gum.

You can also tell me:

• how many days this has been swollen
• if there is pain level 1–10
• whether the tooth feels loose or painful when biting

and I can help assess how serious it may be.

If it has already been swollen for 16 days even after finishing the medicine, you really should have this examined by a dentist soon. A gum swelling that persists that long is commonly caused by:

• a hidden dental abscess
• infected tooth root
• periodontal pocket infection
• cyst-like gum infection
• tartar deep below the gums

The photo shows a very inflamed localized swelling, and mouthwash alone usually cannot fully cure the source if infection is trapped underneath.

For now:

• Continue warm saltwater rinses frequently
• Limit Betadine Gargle and Mouthwash to short 30–60 second rinses only
• Keep brushing gently
• Avoid squeezing or popping the swelling

Very important:
If the bump feels soft, has pus, bad taste, or keeps enlarging, it may need:

• drainage
• deep cleaning
• X-ray
• root canal treatment
• or tooth extraction depending on the cause

Because it has lasted over 2 weeks despite medication, I would not rely on gargling alone anymore.

You should seek urgent care sooner if you develop:

• fever
• facial swelling
• severe throbbing pain
• swollen lymph nodes
• difficulty swallowing or breathing

A dental X-ray is usually the fastest way to find the real source.