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Related Concept Videos

Papillary Dermis01:11

Papillary Dermis

Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Desmosomes01:05

Desmosomes

The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein complexes comprising desmosomal...
Reticular Dermis01:15

Reticular Dermis

The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
Renewal of Skin Epidermal Stem Cells01:12

Renewal of Skin Epidermal Stem Cells

The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular cells,...

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Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus
05:39

Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus

Published on: May 16, 2025

Digitate dermatosis (small-plaque parapsoriasis).

Jesse Lewin1, Jo-Ann Latkowski

  • 1The Ronald O. Perelman Department of Dermatology, New York University School of Medicine, USA.

Dermatology Online Journal
|January 5, 2013
PubMed
Summary
This summary is machine-generated.

This study details a 79-year-old man diagnosed with small-plaque parapsoriasis, a benign skin condition. The diagnosis was based on clinical and histopathologic findings of his distinct erythematous skin patches.

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Area of Science:

  • Dermatology
  • Pathology

Background:

  • Small-plaque parapsoriasis is a debated dermatosis due to its clinical and histopathological overlap with other conditions.
  • Understanding its distinct characteristics is crucial for accurate diagnosis and patient management.

Observation:

  • A 79-year-old male presented with a 15-year history of elongated, erythematous patches on the flanks and smaller, round-oval patches on extremities.
  • Lesions were pruritic and exhibited waxing and waning over time.
  • Clinical presentation included finger-like and round-oval erythematous, slightly scaly patches.

Findings:

  • Clinical and histopathologic evaluation confirmed the diagnosis of small-plaque parapsoriasis.
  • The condition presented as benign, differentiated from more aggressive dermatoses.

Implications:

  • Accurate differentiation of small-plaque parapsoriasis from conditions like mycosis fungoides is essential.
  • This case highlights the importance of thorough clinical and histopathological assessment in diagnosing parapsoriasis variants.
  • Further research may clarify the spectrum between small-plaque parapsoriasis and mycosis fungoides.