Sarcoidosis is an acquired idiopathic.

Sarcoidosis is an acquired idiopathic, multisystem disorder characterized by the agency of noncaseating granulomas in the involved tissue. This condition of unknown

origin is greatest in quantity common in African Americans and northern Europeans. The organs chiefly commonly affected are the lung lymph nodes, skin, and inspections [1-4] Sarcoidosis typically causes no significant derangements, still on occasion the granulomas can become with equal reason large or numerous that they impair the function of the affected organ.

Sarcoidosis is the inference of an immune dysfunction. The immunological features associated with the condition include impaired delayed-type hypersensitivity reactions to cutaneous antigens (anergy), a shift of helper T lymphocyte from the peripheral life-current to sites of disease activity (lymphopenia), and increased production of circulating antibodies. [5] At the site of a non-specific insult, an exaggerated helper T lymphocyte replication causes those cells to accumulate, along with macrophages and other proper spheres until a granuloma forms.

In patients with systemic sarcoidosis, skin lesions come into one's head in 20% to 35% of cases. [6] Cutaneous sarcoidosis without systemic involvement offers in approximately 25% of patients. [7] Because of its diverse skin manifestations, sarcoidosis is greatest in quantity frequently diagnosed by a dermatologist. Table 1 lists the various clinical manifestations of sarcoidosis of the skin. The skin lesions may be specific or nonspecific. Specific skin lesions are generally associated with chronic disease and demonstrate noncaseating granulomas in the dermis upon histological examination. Nonspecific skin lesions are seen primarily with acute disease and noncaseating granulomas are absent.

Specific Skin Lesions

Minus and Grimes reported that flesh-colored waxy papules are the principally frequent cutaneous manifestation of sarcoid in African Americans. [8] These skin lesions present itself mainly on the face and are repeatedly symmetrical. Common locations include the periorbital, perinasal, intranasal, perioral, and occipital areas (Figures 1 and 2) Lichenoid papules of sarcoidosis are multiple and violaceous (purplish) skin lesions that are usually place clustered on the trunk. [9]

Hypopigmented macules either alone or in combination with other sarcoid skin lesions be met with quite often in African American patients [1011] (Figure 3) These light areas of skin can liken other dermatological conditions, such as tinea versicolor, post-in-flammatory hypopigmentation, vitiligo, and T small cavity lymphoma of the skin (mycosis fungoides). The diagnosis is easily made at performing a skin biopsy, which in sarcoidosis will reveal noncaseating granulomas.

Sarcoidal plaques quick in emergencies as raised erythematous /violaceous, indurated, and shiny skin lesions onward the face and extremities (Figure 4) They may become annular in shape and the center of the plaque may become atrophic. If a skin lesion has telangiectatic family vessels on the surface, it is described as angiolupoid. [12]

The principally characteristic of all sarcoid skin lesions is lupus pernio. [13] It nears as chronic sarcoidal plaques with a predilection for the nose, ears, lips, and malar areas of the face. Permanent scarring can arise Lupus pernio is associated with extensive pulmonary infiltration and scarring, chronic uveitis, and bone pouchs When present on the nose, granulomatous infiltration of the nasal mucosa and the upper respiratory tract can befall [14] This may progress to destruction of the nasal septum If a patient currents with lupus pernio, the clinician emergencys to examine the hands. A bulbous or sausage-shaped appearance of the fingers indicates the port of an underlying bone lesion. Radiological examination will likely reveal bone cysts

Subcutaneous nodules of sarcoidosis, also called Darier-Roussy sarcoidosis, [15] appear greatest in number often on the arms and leg These are typically nontender. The overlying skin can be flesh-colored or hypopigmented. These subcutaneous nodules may come into view alone [16] or in association with other cutaneous lesions. [17] upon biopsy, these show noncaseating granulomas in the dermis and subcutaneous tissue.

Ichthyosiform sarcoidosis is an singular skin manifestation of sarcoidosis. [17-20] It at hands as hyperpigmented polygonal-shaped scaly areas forward the lower extremities (Figure 5) They appear "fish-like" and in succession histo-logical examination, noncaseating granulomas are originate This type of sarcoidosis can appear either concurrently with or go before the diagnosis of systemic sarcoidosis. The differential diagnosis of a patient who at hands with acquired ichthyosis of the skin should also include human immunodeficiency virus disease, lymphoproliferative skin malignancies (such as non-Hodgkin's lymphoma), and cancer of the breast, cervix, or lung [21]

Scars from herpes zoster [22] trauma, surgery tattoos, [23] or venipuncture also may become swollen and delicate and show noncaseating granulomas consistent with sarcoidosis. This can portray by action either an initial presentation or a reactivation of pre-existing disease.