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Clear Cell Acanthoma – Causes, Symptoms & Treatment

Clear cell acanthoma is a rare, benign skin tumor that typically appears as a reddish nodule on the lower legs. It is harmless and usually treated by surgical removal.

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Things worth knowing about "Clear Cell Acanthoma"

Clear cell acanthoma is a rare, benign skin tumor that typically appears as a reddish nodule on the lower legs. It is harmless and usually treated by surgical removal.

What is a Clear Cell Acanthoma?

A clear cell acanthoma is a rare, benign (non-cancerous) tumor arising from the outer layer of the skin, known as the epidermis. It was first described by Degos and Civatte in 1962. The name refers to the characteristic pale, glycogen-rich cells visible under the microscope. Clear cell acanthoma has no potential for malignant transformation and is considered a harmless skin lesion.

Causes and Origin

The exact cause of clear cell acanthoma remains unclear. It is debated whether it represents a reactive skin change or a true neoplasm (new tissue growth). Factors discussed in the medical literature include:

Possible reactive inflammatory response of the skin
A localized disorder of keratinization (the normal process of skin cell maturation)
Occasional association with chronic skin conditions such as psoriasis or eczema
No confirmed link to UV radiation exposure or genetic predisposition

Symptoms and Clinical Appearance

Clear cell acanthoma has a distinctive clinical appearance that can assist in diagnosis:

Location: Almost exclusively on the lower legs, rarely on the thigh or foot
Appearance: Round to oval, well-defined, pink to red papule or plaque
Size: Usually between 0.5 and 2 cm in diameter
Surface: Often moist, glistening, or slightly scaly with a characteristic fine collarette of scale at the border
Number: Usually solitary (single lesion), rarely multiple
Symptoms: Mostly asymptomatic; occasional mild itching

Diagnosis

Diagnosis of clear cell acanthoma is based on clinical evaluation and confirmed by histological (tissue) examination. The following methods are used:

Clinical Examination

A dermatologist assesses the lesion based on its typical features, including location, color, and surface texture. The characteristic glistening red nodule on the shin area is often highly suggestive.

Dermatoscopy

Dermatoscopy (dermoscopy) reveals a distinctive pattern: a regular dotted vascular pattern resembling a string of pearls, which is considered characteristic of clear cell acanthoma.

Histology (Tissue Examination)

Definitive diagnosis is established by skin biopsy followed by histological analysis. Microscopic findings include:

Pale, glycogen-rich keratinocytes (skin cells) with optically clear cytoplasm
Regular acanthosis (thickening of the spinous cell layer)
Thinned suprapapillary epidermis
Dilated capillaries in the dermis with an inflammatory infiltrate
Abrupt demarcation of pale cells from the surrounding normal epidermis

Differential Diagnoses

Several other skin conditions may resemble a clear cell acanthoma and must be distinguished from it:

Dermatofibroma
Amelanotic melanoma
Basal cell carcinoma
Pyogenic granuloma
Bowen disease
Psoriasis plaque

Treatment

Since clear cell acanthoma is benign and does not carry a risk of malignant transformation, treatment is indicated primarily when the diagnosis is uncertain, for cosmetic reasons, or if the lesion causes discomfort.

Surgical Excision

Surgical removal is the most common and reliable treatment. The tumor is excised with a small margin of surrounding tissue, and the specimen is sent for histological examination to confirm the diagnosis.

Alternative Treatment Options

Other treatment methods that may be used include:

Cryotherapy (freezing with liquid nitrogen)
Laser therapy (e.g., CO2 laser)
Curettage (scraping of the tissue)

After successful treatment, no further follow-up is typically required. Recurrences are rare.

Prognosis

The prognosis for clear cell acanthoma is excellent. It is a fully benign tumor with no risk of metastasis (spread to other organs). Once completely removed, the condition is considered cured. Routine skin self-examinations and annual dermatology check-ups are generally recommended as part of preventive care.

References

Degos R, Civatte J. - Clear-cell acanthoma: experience of 8 years. Br J Dermatol. 1970;83(2):248-254.
Weedon D. - Weedon's Skin Pathology. 3rd edition. Churchill Livingstone Elsevier, 2010.
Braun-Falco O, Plewig G, Wolff HH et al. - Dermatology. Springer Verlag, 3rd edition, 2009.

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