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Related Concept Videos

Skin Diseases and Disorders01:23

Skin Diseases and Disorders

5.7K
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...
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Skin Cancer01:30

Skin Cancer

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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...
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Papillary Dermis01:11

Papillary Dermis

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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...
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Accessory Structures of the Skin: Sebaceous Glands01:21

Accessory Structures of the Skin: Sebaceous Glands

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A sebaceous gland is a type of oil gland found almost all over the skin ( except palms and soles) and helps lubricate and waterproof the skin and hair. Most sebaceous glands are associated with hair follicles. They generate and excrete sebum, a mixture of lipids, onto the skin surface, thereby naturally lubricating the dry and dead layer of keratinized cells of the stratum corneum, keeping it pliable.
These glands that produce the oils on the skin and hair are holocrine glands. The mature...
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Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

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The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
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Reticular Dermis01:15

Reticular Dermis

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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...
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Updated: Feb 17, 2026

Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus
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Annular skin eruptions.

Bruce J Bart

    Postgraduate Medicine
    |December 7, 2017
    PubMed
    Summary

    Skin eruptions can appear in ring shapes, commonly caused by fungal infections but also by 24 other skin disorders. This review details the causes and treatments for various annular skin conditions.

    Area of Science:

    • Dermatology
    • Medical Mycology
    • Internal Medicine

    Background:

    • Annular skin eruptions are a common dermatological presentation.
    • Fungal infections are a frequent cause of ring-shaped lesions.
    • Numerous non-fungal conditions can also manifest with annular patterns.

    Purpose of the Study:

    • To provide a comprehensive overview of disorders presenting with annular skin eruptions.
    • To illustrate and discuss the causes of 24 distinct conditions resulting in ring-shaped skin lesions.
    • To outline the treatment strategies for these varied annular dermatoses.

    Main Methods:

    • Literature review and synthesis of information on annular skin conditions.
    • Descriptive analysis of clinical presentations.

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    Author Spotlight: Non-Surgical Treatment of Melasma– Microneedling with Tranexamic Acid
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  • Illustrative case examples (implied).

    • Main Results:

    • Identification and categorization of 24 disorders causing annular skin eruptions.
    • Discussion of differential diagnoses including fungal and non-fungal etiologies.
    • Summary of therapeutic approaches for each condition.

    Conclusions:

    • Annular skin patterns are indicative of a wide range of dermatological conditions beyond fungal infections.
    • Accurate diagnosis requires consideration of diverse etiologies.
    • Effective management necessitates tailored treatment based on the underlying cause.