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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] It typically results from mild trauma such as an insect bite. [3]
Nodules are discrete, generally symmetric, hyperpigmented and firm. They are greater than 0.5 cm in both width and depth (as opposed to papules which are less than 0.5 cm). The nodules of PN can appear on any part of the body, but generally are found in areas where patients are able to reach to scratch.
At least 33% resolve without treatment within six years, and 50% within 10 years. [25] Surgical excision is the primary discretionary, elective treatment option for ganglion cysts. Alternatively, a hypodermic needle may be used to drain the fluid from the cyst (via aspiration). [26]
Angiolipomas are painful subcutaneous nodules having all other features of a typical lipoma. [7]: 624 [9] Cerebellar pontine angle and internal auditory canal lipomas [10] Chondroid lipomas are deep-seated, firm, yellow tumors that characteristically occur on the legs of women. [7]: 625
The redness starts to fade and it gradually becomes softer and smaller until it disappears. Each nodule usually heals completely without scarring over the course of about two weeks. [3] [4] Joint pain and inflammation sometimes continue for several weeks or months after the nodules appear. [5] Less common variants of erythema nodosum include:
Since the diseased area (lesion) is not encapsulated, clinical margins are difficult to define. As such, portions of the diseased tissue may be left in the foot after surgery. Inadequate excision is the leading cause of recurrence. [2] [7] Radiotherapy has been shown to reduce the size of the nodules and reduce the pain associated with them.
Fibroma of tendon sheath is a benign tumor that presents as a small subcutaneous nodule that slowly increases in size. [1] This is a notably uncommon condition. According to case report literature, the tumors often have a multinodular growth pattern, with individual nodules being composed of bland, slender, spindle-shaped cells (myofibroblasts) in a dense, fibrous matrix.” [2] A common ...
Keratoacanthoma (KA) is a common low-grade (unlikely to metastasize or invade) rapidly-growing skin tumour that is believed to originate from the hair follicle (pilosebaceous unit) and can resemble squamous cell carcinoma.