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Granuloma annulare is a skin disease of unknown cause in which granulomas are found in the dermis of the skin, but it is not a true granuloma. Typically, a central zone of necrobiotic generation of collagen is seen, with surrounding inflammation and mucin deposition on pathology.
A pyogenic granuloma or lobular capillary hemangioma [3] is a vascular tumor that occurs on both mucosa and skin, and appears as an overgrowth of tissue due to irritation, physical trauma, or hormonal factors. [4] [5] It is often found to involve the gums, skin, or nasal septum, and has also been found far from the head, such as in the thigh. [6]
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Palisaded neutrophilic and granulomatous dermatitis (PNGS) is usually associated with a well-defined connective tissue disease, lupus erythematosus or rheumatoid arthritis most commonly, and often presents with eroded or ulcerated symmetrically distributed umbilicated papules or nodules on the elbows.
It is believed that an augmented cell-mediated immune response to one or more undiscovered antigens is the cause of the granulomatous inflammation. [6] Environmental exposure may have a role in the etiology of sarcoidosis, as evidenced by the development of granulomas that resemble sarcoid granulomas after exposure to metals such beryllium ...
Pyogenic granuloma. A pyogenic granuloma, is a small benign vascular tumor that primarily involves the skin (88.2%) and mucous membranes. [6] Pyogenic granuloma appears as a red macule that grows rapidly, turns into a papule and eventually becomes pedunculated, being attached to a narrow stalk. [8]
When actinic granuloma-like lesions appear in non-exposed areas, the rash is known as annular elastolytic giant cell granuloma. Though these can be easily distinguished based on histopathologic features and laboratory findings, the differential diagnosis includes tinea corporis , sarcoidosis , subacute lupus erythematosus , granuloma annulare ...
Pigmentation changes in PVA, apparent in the epidermal (outermost) skin layer, may be attributed to incontinence (leaking out) of melanin from melanocytes into the dermal skin layer below. [5] Inflammation of the skin and cutaneous tissue, common with PVA, [ 7 ] also contributes to color changes in the skin, typified by redness.