From your description and the image, this looks like herpes labialis (cold sore) rather than a simple pimple. These usually start like small bumps, then become painful, swollen, and may increase to 2–3 lesions as you described.
Next Steps
1. Start a topical antiviral cream like Acyclovir 5% (apply 4–5 times daily)
2. If pain and swelling are significant or lesions are multiple, you may need oral antiviral medication (after consulting a doctor)
3. Use a mild pain relief gel if needed
4. Keep the area clean and avoid touching/picking
Health Tips
- These sores are contagious, avoid kissing or sharing towels and other items till healed
- Avoid spicy, salty, or very hot foods as they can increase irritation
- Stress, low immunity, or fever can trigger such episodes
- If this keeps recurring frequently, evaluation may be needed
Most cases settle in 5–7 days, but early treatment helps reduce pain and duration.