Acne vulgaris is
characterized by an accumulation ofsebum (oily substance secreted by the sebaceous glands of the skin) associated with a
hypersecretion of keratin (an importantprotein in the skin, hair, nails, hooves, horns, teeth, etc.) and a bacterial proliferation. This medical disorder causes an inflammation of the
pilosebaceous follicles, resulting in the formation of, sometimes, open comedones (blackheads), sometimes
closed comedones (whiteheads), pustules (small collection of pus in the top or beneath the layer of skin) or
nodules (lumps or inflammatory lesion).
In the most serious forms of acne, there are deep
and purulent cysts, redness, swelling, scars and other serious skin damages. Acne occurs mainly in areas of high
concentration of sebaceous glands, mainly face, neck, chest and back.
Acne rosacea is characterized by redness of the
face. The skin turns red giving an appearance of sunburn. The face is covered in small, pus-filled sacs on areas
of the nose, cheeks, forehead or chin. In some cases, small blood
vessels appear on the face and increase the volume of tissues in the nose. In more than 50% of acnes rosacea,
the patient feels a burning sensation in his eyes. He has the impression of having sand in his