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2. Hyperpigmentation - Wikipedia

   en.wikipedia.org/wiki/Hyperpigmentation

   Hyperpigmentation can be diffuse or focal, affecting such areas as the face and the back of the hands. Melanin is produced by melanocytes at the lower layer of the epidermis. Melanin is a class of pigment responsible for producing color in the body in places such as the eyes, skin, and hair. The process of melanin synthesis (melanogenesis ...

3. Vitiligo - Wikipedia

   en.wikipedia.org/wiki/Vitiligo

   1% of people [ 4 ] Vitiligo (/ ˌvɪtɪˈlaɪɡoʊ /) 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. [ 5 ][ 6 ] Treatment options include topical medications, light therapy ...

4. Acanthosis nigricans - Wikipedia

   en.wikipedia.org/wiki/Acanthosis_nigricans

   Acanthosis nigricans. Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [2] such as the posterior and lateral folds of the neck, the armpits, groin, navel, forehead and other areas. [1]

5. Schamberg disease - Wikipedia

   en.wikipedia.org/wiki/Schamberg_disease

   The pattern of the eruption changes, with slow extension and often some clearing of the original lesions. Schamberg's disease, or progressive pigmented purpuric dermatosis, is a chronic discoloration of the skin which usually affects the legs and often spreads slowly. This disease is more common in males and may occur at any age from childhood ...

6. Melasma - Wikipedia

   en.wikipedia.org/wiki/Melasma

   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]

7. Keratosis pilaris - Wikipedia

   en.wikipedia.org/wiki/Keratosis_pilaris

   Keratosis pilaris. Keratosis pilaris (KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin[1]) is a common, autosomal - dominant, genetic condition of the skin's hair follicles characterized by the appearance of possibly itchy, small, gooseflesh -like bumps, with varying degrees of reddening or inflammation. [2]