Canker sores have a litany of causes including trauma, hormonal changes, stress, and food allergies, explains Hannah Kopelman, D.O., a dermatologist at Kopelman Aesthetic Surgery.

Canker sores have a litany of causes including trauma, hormonal changes, stress, and food allergies, explains Hannah Kopelman, D.O., a dermatologist at Kopelman Aesthetic Surgery.

A plastic surgeon explained what causes the lip line to appear like this and how to avoid ... Trauma or certain dermatological conditions can ... Kopelman reassures that there are multiple ...