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It usually appears on the face around the upper lip, cheeks, and forehead in patches. While the cause is unknown, experts have come to realize that there's a strong link between the condition and ...
Due to this, dark pigmentation may be visible on the oral mucosa or skin. [10] Most common oral sites include: buccal mucosa, lips, gums, hard palate or tongue. Intraoral sites are usually seen as the first sign and they usually develop prior to the skin lesions. [11]
Melasma (also known as chloasma faciei, [1]: 854 or the mask of pregnancy [2] when present in pregnant women) is a tan or dark skin discoloration.Melasma is thought to be caused by sun exposure, genetic predisposition, hormone changes, and skin irritation. [3]
The distinctive solid black colour of the Ayam Cemani (rooster shown) chicken breed is due to hyperpigmentation, with the bird's feathers, skin, beak and internal organs all being affected. Hyperpigmentation can be caused by sun damage, inflammation, or other skin injuries, including those related to acne vulgaris.
Ahead, you'll find a guide to the best lip balms, tested by dermatologists and skin experts. Cicaplast Lip Balm B5. This non-greasy, fragrance-free lip balm is a winner in our book for many ...
Peutz–Jeghers syndrome, dark patches on the lips etc. Piebaldism, patchy absence of melanin-producing cells; Vitiligo, a skin condition which causes areas of the skin to lose its colour; Xanthochromism, an unusual yellow colouration in animals; Zelandoperla fenestrata, a stonefly exhibiting a Batesian mimicry melanic polymorphism
Vitiligo (/ ˌ v ɪ t ɪ ˈ l aɪ ɡ oʊ /, vi-ti-leye-goh) is a chronic autoimmune disorder that causes patches of skin to lose pigment or color. [1] The cause of vitiligo is unknown, but it may be related to immune system changes, genetic factors, stress, or sun exposure.
Smoker melanosis in a patient consuming 2 packs of cigarette per day. Smoking or the use of nicotine-containing drugs is the cause to Smoker's melanosis. [10] [11] Tar-components (benzopyrenes) are also known to stimulate melanocytes to melanin production, and other unknown toxic agents in tobacco may also be the cause.