Histologic Diagnosis of Inflammatory Skin Diseases

Tinea nigra

…Comment A solitary, well-circumscribed, circinate, brown-black patch on a palm is the presentation most common of tinea nigra. Sometimes, there may be more than a single patch, and, at times, a sole patch may be the only involvement. Hyphae and spore…

Histologic Diagnosis of Inflammatory Skin Diseases

Errors and Reasons

…icroabscesses are requisite for diagnosis histopathologic of a patch or plaque of mycosis fungoides. Reason: As a rule, lymphocytes in patches and in subtly elevated plaques of mycosis fungoides are small and disposed entirely as solitary units in th…

Dermatology Practical & Conceptual

Notalgia paresthetica: the unreachable itch

…he patient’s left scapula is visible as a hyperpigmented patch. (B) The hyperpigmented patch is highlighted on the patient’s mid-back. [Copyright: ©2013 Ellis.] On examination, there was a hyperpigmented patch medial to the left scapula w…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Parapsoriasis?

…ons have the characteristic reddish-orange hue associated with patch and early plaque lesions of mycosis fungoides as they present themselves in Caucasians. Histopathologically, the lesions are characterized by patchy lichenoid infiltrates of lymphoc…

Dermatology Practical & Conceptual

Melanoma and satellite blue papule

…diagnosis. Figure 1. Simultaneously observed irregular brown patch (distal third) and blue papule (proximal third) on the dorsal aspect of the right arm. [Copyright: ©2014 Oliveira et al.] Figure 2. Dermoscopy observation (brown patch): atypical…

Differential Diagnosis in Dermatopathology

Discussions

…bly indolent; in most patients, lesions do not progress beyond patches during the course of a lifetime. Only rarely do lesions evolve through patch, plaque, nodular, and tumor stages, and then usually at a petty pace. The vast majority of patients wi…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Cutaneous T-cell Lymphoma?

…h a long evolution. Three kinds of lesions are characteristic: patches, plaques, and tumours. A patch is a flat skin lesion recognizable by the fact that its colour is different from that of the surrounding normal skin. In CTCL, patches are often ery…