Quick Summary
- Impetigo is a bacterial skin infection that causes honey-colored, crusted sores, common in young children, and can appear anywhere on the face or body.
- Cold sores are caused by herpes simplex virus and typically form small, painful blisters specifically at the border of the lips.
- Impetigo's crust has a distinctive golden-yellow, almost honey-like color; cold sore blisters crust over more translucent and yellow-gray.
- Cold sores often recur in the exact same spot repeatedly, sometimes preceded by tingling; impetigo doesn't have this recurring pattern.
- Both are contagious and treatable, but impetigo needs antibiotics while cold sores are managed with antiviral medication.
Impetigo and cold sores can both cause crusting, blistering sores near the mouth, and both are contagious — but one is a bacterial skin infection and the other is a viral condition, which means the right treatment looks completely different.
What Impetigo Looks Like
Impetigo is a bacterial infection (usually Staphylococcus or Streptococcus) that most commonly affects young children, though it can occur at any age. It typically starts as small red sores or blisters that quickly rupture and develop a distinctive honey-colored or golden-yellow crust — this crust color is one of the most recognizable features of impetigo. It can appear anywhere on the face (commonly around the nose and mouth) or body, and spreads easily through direct contact, making it common in daycare and school settings.
What Cold Sores Look Like
Cold sores (also called fever blisters) are caused by herpes simplex virus, most often type 1. They typically appear as a cluster of small, painful, fluid-filled blisters right at the border of the lips or around the mouth, often preceded by a tingling, burning, or itching sensation hours before the blisters appear. Unlike impetigo, cold sores are a recurring condition — once someone is infected with the virus, it stays in the body and can reactivate in the same spot repeatedly, often triggered by stress, illness, sun exposure, or a weakened immune system.
Key Differences at a Glance
| Feature | Impetigo | Cold Sores |
|---|---|---|
| Cause | Bacterial infection | Herpes simplex virus |
| Crust color | Honey-colored, golden-yellow | Yellow-gray, more translucent |
| Location | Anywhere on face or body | Specifically at the lip border |
| Recurrence | Not a recurring pattern | Often recurs in the same spot |
| Treatment | Topical or oral antibiotics | Antiviral medication |
Why Getting This Right Matters
Antibiotics do nothing for a viral cold sore, and antiviral cream won't clear a bacterial infection like impetigo — so an accurate diagnosis directly determines whether treatment actually works. Both conditions are also contagious in different ways: impetigo spreads through direct contact with the sores or contaminated items, while cold sores spread through direct contact, including kissing, even when blisters aren't visibly active.
Dealing with sores around the mouth or face?
Our board-certified dermatologists see patients at our Burien and Bellevue offices — same-week appointments are often available.
Schedule a Skin CheckWhen to See a Doctor
Impetigo in children is common enough that a pediatrician or dermatologist visit is reasonable for any suspicious honey-crusted sore, both for prompt antibiotic treatment and to limit spread at school or daycare. Frequent or severe cold sore outbreaks are also worth discussing with a doctor — prescription antiviral medication can shorten outbreaks and, taken preventively, reduce how often they recur.