Scleromyxedema
Synonyms and keywords:: Generalized lichen myxedematosus, sclerodermoid lichen myxedematosus.

# Overview
Papular mucinosis (also known as "Scleromyxedema," "Generalized lichen myxedematosus," and "Sclerodermoid lichen myxedematosus") is a rare skin disease. Localized and disseminated cases are called papular mucinosis or lichen myxedematosus while generalized, confluent papular forms with sclerosis are called scleromyxedema. Frequently, all three forms are regarded as papular mucinosis. However, some authors restrict it to only mild cases. Another form, acral persistent papular mucinosis is regarded as a separate entity.

# Classification
Papular mucinosis may be divided into several types or variants:
- Acral persistent papular mucinosis
- Self-healing papular mucinosis
- Papular mucinosis of infancy
- Cutaneous mucinosis of infancy
- Nodular lichen myxedematosus
- Localized lichen myxedematosus
- Discrete papular lichen myxedematosus

# Incidence
Papular mucinosis affects adults of both sexes equally and appears between ages 30 and 80. Recently, it has been reported in patients infected with the HIV/AIDS virus.

# Differentiating Scleromyxedema from other Diseases
Scleromyxedema must be differentiated from other diseases that cause skin thickening and edema such as:
- Scleredema
- Scleroderma
- Eosinophilic fasciitis
- Chronic graft-versus-host disease
- Drug induced scleroderma
- Scleroderma overlap syndromes
- Diabetic cheiroarthropathy
- Myxedema
- Nephrogenic systemic fibrosis
For more information on differentiating scleromyxedema, click here.

# Characteristic
Papular mucinosis is chronic and may be progressive. The dermal layer of the skin breaks out into small and solid bumps, usually conical in shape and measured from 2 to 4 mm or sometimes flat-topped papules. Unlike pustules, these bumps do not contain pus. Instead they contain mucin, a substance of mucus, the body's natural and protective lubricant found in saliva and epithelial cells in lungs and the sensitive part of the nose. They usually come in clusters such as linear arrays. Less frequently, urticarial, nodular, or sometimes annular lesions may be appreciated. The dorsal aspect of the hands, face, elbows, and extensor portions of the extremities are most frequently affected. Mucosal lesions are absent. The coalescence of papules on the face, particularly on the glabella, results in longitudinal folding and gives the appearance of a leonine facies.
In scleromyxedema, symptoms can occur on larger part of the body. Erythema and scleroderma-like induration occurs on the skin. In addition, the mobility of the lips, hands, arms, and legs is reduced. Proximal myopathy, inflammatory polyarthritis, central nervous system symptoms, esophageal aperistalsis, and hoarseness are among the notable systemic symptoms. If viscera is involved, the disease will be fatal. The dermatoneuro syndrome is a rare neurological complication of the disease presenting with fever, seizures and altered mental status.

# Physical examination

## Gallery

### Skin
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# Treatment
There is no effective treatment for this condition. It has been reported that clearance of lesions can be done with melphalan and cyclophosphamide alone or in combination with prednisone. Both isotretinoin and etretinate have also been shown to improve the conditions. All medications listed can cause adverse symptoms, with isotretinoin and etretinate particularly dangerous since they are both teratogens. Other attempted treatments include interferon-alpha, cyclosporine, PUVA photochemotherapy, electron-beam therapy, IVIg, and dermabrasion. However, the overall prognosis for the disease is poor.  There are reported instances of remission of the disease when treated with a combination of Revlimid and Dexamethasone over a 24 month period.