Acne vulgaris is characterized by an accumulation of
sebum (oily substance secreted by the
sebaceous glands of the skin) associated with a hypersecretion of keratin (an important protein 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 eyes.