Related Experiment Video
Updated: Aug 7, 2026
07:42
A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception
Published on: March 3, 2018
Koebner phenomenon: what you don't know may hurt you
1Plastic Surgery Associates of Redding and Mercy Medical Center, CA, USA.
Annals of Plastic Surgery
|July 7, 2000
Summary
The Koebner phenomenon causes new skin lesions at distant wound sites in patients with existing skin conditions like psoriasis. Surgeons must recognize this and inform patients of the risk.
Area of Science:
- Dermatology
- Pathology
Background:
- The Koebner phenomenon describes isomorphic skin lesions appearing at sites distant from initial injury.
- This reaction is frequently observed in patients with psoriasis but can manifest in other dermatoses.
Observation:
- Isomorphic lesions develop in previously unaffected skin areas following trauma.
- The phenomenon highlights a specific immune or inflammatory response in certain skin diseases.
Findings:
- Koebnerization is most common in psoriasis.
- It can occur across a spectrum of cutaneous diseases, indicating a shared underlying pathophysiology.
Implications:
- Surgical and medical practitioners should be aware of the Koebner phenomenon.
- Informing patients about this potential complication is crucial for managing expectations and treatment outcomes.
More Related Videos
Related Concept Videos
01:08The Availability Heuristic
A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):
01:12Hindsight Biases
Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
01:14Fundamental Attribution Error
According to some social psychologists, people tend to overemphasize internal factors as explanations—or attributions—for the behavior of other people. They tend to assume that the behavior of another person is a trait of that person, and to underestimate the power of the situation on the behavior of others. They tend to fail to recognize when the behavior of another is due to situational variables, and thus to the person’s state. This erroneous assumption is called the fundamental attribution...
01:29Blood and Nerve Supply to the Bones
Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
01:15Subconsciousness and No Awareness
The concept of subconscious awareness refers to the processing of information below the level of conscious thought, which significantly influences both behaviors and decisions. It is also known as waking subconscious awareness. This complex level of cognition operates without the direct awareness of the individual, facilitating rapid and simultaneous handling of multiple information streams.
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
01:29Introspection
Introspection, long upheld as a reliable route to self-knowledge, involves examining one's thoughts, emotions, and mental processes. It underpins many psychological practices, from mindfulness meditation to psychotherapy and self-help strategies. However, empirical evidence challenges the accuracy of introspection as a means of understanding oneself.Limitations of Introspective InsightSeminal work by Nisbett and Wilson demonstrated that individuals are frequently unaware of the true causes...