1. Irritant contact dermatitis: from constant friction especially on bony area of nasal bridge due to the metal straps and rubber straps of some masks.2. Allergic contact dermatitis: some “medical” masks contain formaldehyde which is a known irritant that can cause redness, itchiness & burning. Some cloth masks release dyes and detergents which can also contribute to dermatitis.3. Acne Flares: From mask friction that blocks the oil glands and from the humid microclimate created inside mask from breathing in and out. This is probably the most common issue I see in my practice.4. Redness : from constant pressure and rubbing of mask.