Two methods of classification are used for<unk> . One divides them into either generalized versus localized<unk> , while the other divides them into congenital versus acquired. Congenital Congenital forms of<unk>  are caused by genetic mutations, and are extremely rare, unlike acquired forms. Congenital<unk>  is always present at birth.<unk>  lanuginosa :Congenital<unk>  lanuginosa can be noticed at birth, with the infant completely covered in thin lanugo hair. In normal circumstances, lanugo hair is shed before birth and replaced by vellus hair; however, in a person with congenital<unk>  lanuginosa, the lanugo hair remains after birth. The palms of the hands, soles of the feet, and mucous membranes are not affected. As the person ages, the lanugo hair may thin, leaving only limited areas of<unk> . ;Generalized<unk>  :Congenital generalized<unk>  causes males to exhibit excessive facial and upper body hair, whereas women exhibit less severe asymmetrical hair distribution. The palms, soles, and mucous membranes are not affected. ;Terminal<unk>  :Congenital terminal<unk>  is characterized by the presence of fully pigmented terminal hair that covers the entire body. This condition is usually accompanied by gingival hyperplasia. This form is most responsible for the term "werewolf syndrome" because of the thick, dark hair that appears. People with this condition are sometimes performers at circuses because of their unusual appearance. ;Circumscribed<unk>  :Congenital circumscribed<unk>  is associated with the presence of thick vellus hair on the upper extremities. Circumscribed signifies this type of<unk>  is restricted to certain parts of the body, in this case, the extensor surfaces of the upper extremities. Hairy elbow syndrome, a type of congenital circumscribed<unk> , shows excessive growth on and around the elbows. This type of<unk>  is present at birth, becomes more prominent during aging, and regresses at puberty. ;Localized<unk>  :Congenital localized<unk>  is a localized increase in hair density and length. ;Nevoid<unk>  :Nevoid<unk>  may be present at birth or appear later in life. It features an isolated area of excessive terminal hair and is usually not related to any other diseases. Acquired Acquired<unk>  appears after birth. The multiple causes include the side effects of drugs, associations with cancer, and possible links with eating disorders. Acquired forms can usually be reduced with various treatments.<unk>  lanuginosa :Acquired<unk>  lanuginosa is characterized by rapid growth of lanugo hair, particularly on the face. Hair also appears on the trunk and armpits, while palms and soles are unaffected. The excess hair is commonly referred to as malignant down. This hair is very fine and unpigmented. ;Generalized<unk>  :Acquired generalized<unk>  commonly affects the cheeks, upper lip, and chin. This form also affects the forearms and legs, but is less common in these areas. Another deformity associated with acquired generalized<unk>  is multiple hairs occupying the same follicle. It may also include abnormal hair growth patterns as what happens to the eyelashes in a condition known as trichiasis. Oral minoxidil treatments for hypertension are known to cause this condition. Topical minoxidil used for alopecia causes hair growth in the areas where it is applied; however, this hair disappears shortly after discontinuing the use of topical minoxidil. ;Patterned<unk>  :Acquired patterned<unk>  is an increase in hair growth in a pattern formation. It is similar to acquired generalized<unk>  and is a sign of internal malignancy. ;Localized<unk>  :Acquired localized<unk>  is an increase in hair density and length often secondary to irritation or trauma. This form is restricted to certain areas of the body. Hirsutism<unk>  is often mistakenly classified as hirsutism. Hirsutism is a type of<unk>  exclusive to women and children, resulting from an excess of androgen-sensitive hair growth. Patients with hirsutism exhibit patterns of adult male hair growth. Chest and back hair are often present on women with hirsutism. Hirsutism is both congenital and acquired. It is linked to excessive male hormones in women, thus symptoms may include acne, deepening of the voice, irregular menstrual periods, and the formation of a more masculine body shape. Increases in androgen (male hormone) levels are the primary cause of most hirsutism cases. If caused by increased levels of androgens, it can be treated with medications that reduce androgen levels. Some birth control pills and spironolactone reduce androgen levels.
Hypertrichosis
Auricular hypertrichosis
Hyperpigmentation
Hypopigmentation
Green nails
Generalized lentiginosis
Amastia
Granulomatous slack skin