Whether a blood blister scars depends on its depth.
According to Dr. Khetarpal, the deeper the injury, the more likely a scar is to form. Specifically, "[t]he deeper the injury (particularly when it comes to a chemical or heat burn), the more likely it is for a scar to form." However, "typically, friction blisters do not scar as they tend to be more superficial." This suggests that most blood blisters, which are often caused by friction, are unlikely to leave a scar.
| Factor | Likelihood of Scarring |
|---|---|
| Depth of Blister | Deeper blisters are more likely to scar |
| Cause of Blister | Friction blisters (often superficial) are less likely to scar |
In summary: Superficial blood blisters caused by friction are usually not deep enough to cause scarring. Deeper blisters, especially those caused by burns, have a higher chance of scarring.
