Differential Diagnosis in Dermatopathology

Discussions

Nevus verrucosus and acanthosis nigricans are processes that affect the papillary dermis and the epidermis. Both conditions may display hyperkeratosis, epidermal hyperpigmentation, papillomatosis, melanophages, and an increased number of fibrocytes…

Differential Diagnosis in Dermatopathology

Pityriasis lichenoides acuta vs. Pityriasis lichenoides chronica

A condition of persons of any age, but particularly children with a genetic proclivity for allergic rhinitis and conjunctivitis, and allergic asthma. Intense pruritus induces patients to rub the skin intensely and to scratch furiously, the resultant…

Histologic Diagnosis of Inflammatory Skin Diseases

Nodular vasculitis

…tz M, Elsner P. Erythema induratum of Bazin and Poncet’s disease—successful treatment with antitubercular drugs. J Eur Acad Dermatol Venereol 2003;17(3):334-36. Montgomery H, O’Leary PA, Barker NW. Nodular vascular diseases of the legs: e…

Living with Rosacea

Living with Rosacea

Rosacea has significant impact on quality of life, an observation that has been validated by a number of qualitative and quantitative studies using disease severity instruments such as the Dermatology Life Quality Index (DLQI) and Willingness-to-pa…

Histologic Diagnosis of Inflammatory Skin Diseases

Gas gangrene

Gas gangrene Synonyms Clostridial myonecrosis Presentation stereotypical Age and sex Usually adults of both sexes Distribution of lesions Localized to sites of deep wounds Individual lesions Dusky erythematous plaques and hemorrhagic bullae through…

Erythema in Rosacea

Erythema in Rosacea

Current treatment of erythema in rosacea This type has traditionally been treated with avoidance of flushing, photoprotection, and surgical strategies including electrosurgery or laser therapies to treat the erythema and telangiectasias.  Laser the…

Differential Diagnosis in Dermatopathology

Discussions

…es acuta and pityriasis lichenoides chronica are not different diseases, but different names for changes morphologic of the same disease. Pityriasis lichenoides acuta and pityriasis lichenoides chronica have many findings histopathologic in common: m…

Differential Diagnosis in Dermatopathology

Discussions

Urticaria and the urticarial stage of bullous pemphigoid have several findings histopathologic in common, chiefly superficial and mid- or deep dermal perivascular and interstitial mixed-cell infiltrates in which eosinophils are prominent in the inte…