Plaque<unk> <unk> oriatic plaque, showing a silvery center surrounded by a reddened border<unk>  vulgaris (also known as chronic stationary<unk>  or plaque-like<unk>  is the most common form and affects 85–90% of people with<unk> . Plaque<unk>  typically appears as raised areas of inflamed skin covered with silvery-white, scaly skin. These areas are called plaques and are most commonly found on the elbows, knees, scalp, and back. Image:Psoriasis2010a.Plaques of<unk>  Image:Psoriasis.A person's arm covered with plaque<unk>  File:Psoriasis of the palms.Psoriasis of the palms Other forms Additional types of<unk>  comprise about 10% of cases. They include pustular, inverse, napkin, guttate, oral, and seborrheic-like forms. Pustular<unk>  Severe generalized pustular<unk>  Pustular<unk>  appears as raised bumps filled with noninfectious pus (pustules). The skin under and surrounding the pustules is red and tender. Pustular<unk>  can either be localized or more widespread throughout the body. Two types of localized pustular<unk>  include<unk>  pustulosa palmoplantaris and acrodermatitis continua of Hallopeau; both forms are localized to the hands and feet. Inverse<unk>  Inverse<unk>  (also known as flexural<unk>  appears as smooth, inflamed patches of skin. The patches frequently affect skin folds, particularly around the genitals (between the thigh and groin), the armpits, in the skin folds of an overweight abdomen (known as panniculus), between the buttocks in the intergluteal cleft, and under the breasts in the inframammary fold. Heat, trauma, and infection are thought to play a role in the development of this atypical form of<unk> . Napkin<unk>  Napkin<unk>  is a subtype of<unk>  common in infants characterized by red papules with silver scale in the diaper area that may extend to the torso or limbs. Napkin<unk>  is often misdiagnosed as napkin dermatitis (diaper rash). Guttate<unk>  Example of guttate<unk>  Guttate<unk>  is characterized by numerous small, scaly, red or pink, droplet-like lesions (papules). These numerous spots of<unk>  appear over large areas of the body, primarily the trunk, but also the limbs and scalp. Guttate<unk>  is often triggered by a streptococcal infection, typically streptococcal pharyngitis. Erythrodermic<unk> <unk> oriatic erythroderma (erythrodermic<unk>  involves widespread inflammation and exfoliation of the skin over most of the body surface, often involving greater than 90% of the body surface area. It may be accompanied by severe dryness, itching, swelling, and pain. It can develop from any type of<unk> . It is often the result of an exacerbation of unstable plaque<unk> , particularly following the abrupt withdrawal of systemic glucocorticoids. This form of<unk>  can be fatal as the extreme inflammation and exfoliation disrupt the body's ability to regulate temperature and perform barrier functions. Mouth<unk>  in the mouth is very rare, in contrast to lichen planus, another common papulosquamous disorder that commonly involves both the skin and mouth. When<unk>  involves the oral mucosa (the lining of the mouth), it may be asymptomatic, but it may appear as white or grey-yellow plaques. Fissured tongue is the most common finding in those with oral<unk>  and has been reported to occur in 6.5–20% of people with<unk>  affecting the skin. The microscopic appearance of oral mucosa affected by geographic tongue (migratory stomatitis) is very similar to the appearance of<unk> . However, modern studies have failed to demonstrate any link between the two conditions. Seborrheic-like<unk>  Seborrheic-like<unk>  is a common form of<unk>  with clinical aspects of<unk>  and seborrheic dermatitis, and it may be difficult to distinguish from the latter. This form of<unk>  typically manifests as red plaques with greasy scales in areas of higher sebum production such as the scalp, forehead, skin folds next to the nose, the skin surrounding the mouth, skin on the chest above the sternum, and in skin folds.<unk> oriatic arthritis<unk> oriatic arthritis is a form of chronic inflammatory arthritis that has a highly variable clinical presentation and frequently occurs in association with skin and nail<unk> . It typically involves painful inflammation of the joints and surrounding connective tissue, and can occur in any joint, but most commonly affects the joints of the fingers and toes. This can result in a sausage-shaped swelling of the fingers and toes known as dactylitis.<unk> oriatic arthritis can also affect the hips, knees, spine (spondylitis), and sacroiliac joint (sacroiliitis). About 30% of individuals with<unk>  will develop<unk> oriatic arthritis. Skin manifestations of<unk>  tend to occur before arthritic manifestations in about 75% of cases. Nail changes<unk>  of a fingernail, with visible pitting A photograph showing the effects of<unk>  on the toenails<unk>  can affect the nails and produces a variety of changes in the appearance of fingers and toenails. Nail<unk>  occurs in 40–45% of people with<unk>  affecting the skin, and has a lifetime incidence of 80–90% in those with<unk> oriatic arthritis. These changes include pitting of the nails (pinhead-sized depressions in the nail is seen in 70% with nail<unk> , whitening of the nail, small areas of bleeding from capillaries under the nail, yellow-reddish discoloration of the nails known as the oil drop or salmon spots, dryness, thickening of the skin under the nail (subungual hyperkeratosis), loosening and separation of the nail (onycholysis), and crumbling of the nail. Medical signs In addition to the appearance and distribution of the rash, specific medical signs may be used by medical practitioners to assist with diagnosis. These may include Auspitz's sign (pinpoint bleeding when scale is removed), Koebner phenomenon <unk> oriatic skin lesions induced by trauma to the skin), and itching and pain localized to papules and plaques.
Psoriasis
Onychomycosis
Parapsoriasis
Basal-cell carcinoma
Lupus vulgaris
Dermatitis
Vitiligo
Dandruff