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The majority of epidermal inclusion cysts originate from the infundibular portion of the hair follicle, thus explaining the interchangeable, [14] yet inaccurate, use of these two terms. Epidermoid cyst may be classified as a sebaceous cyst , [ 15 ] although technically speaking it is not sebaceous. [ 16 ] "
A dermatofibroma, or benign fibrous histiocytomas, is a benign nodule in the skin, typically on the legs, elbows or chest of an adult. [3] It is usually painless. [3]It usually ranges from 0.2cm to 2cm in size but larger examples have been reported. [3]
Epidermal cyst (epidermal inclusion cyst, epidermoid cyst, infundibular cyst, keratin cyst) Epidermal nevus syndrome (Feuerstein and Mims syndrome, Solomon's syndrome) Epidermolytic acanthoma; Epithelioma cuniculatum (Ackerman tumor, carcinoma cuniculatum) Eruptive vellus hair cyst; Erythroplasia of Queyrat; Extramammary Paget's disease ...
Diagnosis [ edit ] Micrograph of erythema annulare centrifugum, showing a moderately intense superficial perivascular dermal lymphohistiocytic infiltrate with rare eosinophils, edema of papillary dermis, hyperkeratosis and focal epidermal spongiosis.
A cyst is related to an abscess, but it contains a material other than pus, and a cyst has a clearly defined wall. Abscesses can also form internally on internal organs and after surgery. They are usually caused by a bacterial infection. [10] Often many different types of bacteria are involved in a single infection. [8]
A dermoid cyst is a teratoma of a cystic nature that contains an array of developmentally mature, solid tissues. It frequently consists of skin, hair follicles, and sweat glands, while other commonly found components include clumps of long hair, pockets of sebum, blood, fat, bone, nail, teeth, eyes, cartilage, and thyroid tissue.
Visual diagnosis is made by the "stuck on" appearance, horny pearls or cysts embedded in the structure. Darkly pigmented lesions can be challenging to distinguish from nodular melanomas. [ 10 ] Furthermore, thin seborrheic keratoses on facial skin can be very difficult to differentiate from lentigo maligna even with dermatoscopy .
Pilomatricoma is a benign skin tumor derived from the hair matrix. [2] [3] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities.