Dermatology: describe skin changes clearly
Dermatology involves skin and associated structures (hair & nails). An effective first step is a detailed written description of a skin change, rather than a diagnosis chosen from a photograph. Describe structure, location, texture and change over time. The purpose of this guide is to establish a basic method for learning about skin and separating your observations from those used for a diagnosis or for choosing treatments.
Connect the layers with their roles
The epidermis is the outer layer of skin. Beneath this is the dermis which contains many things like blood vessels, nerves and glands. Subcutaneous tissue lies below the dermis. All these layers help protect us, provide sensation, and regulate our body heat. Use a diagram to put an object in its appropriate layer and tell what that object does. Connect the structures with their functions rather than learning labels alone.
Skin layers work together rather than acting as independent sheets. A surface barrier, supporting tissues, nerves and glands contribute different functions to the same organ. A diagram helps show their relationships, while an examination shows only some features directly. Connect a visible skin change with the relevant anatomy carefully, rather than assuming that its appearance reveals everything happening beneath the surface.
Record what is visible
Describe where (location) your skin change is located. What is its approximate length/width? Is it oval, circular, irregularly shaped? Are you able to describe its colour(s)? Appearance varies with skin tone and lighting. As well as being raised (elevated), skin changes can be flat. They can be smooth, scaly, weeping or have a break in them. Do these characteristics help you describe what you are seeing better?
A description can also include how changes are distributed: one area or several, a local patch or a wider pattern. Record the features you can observe before choosing a label. Lighting, camera settings and skin tone affect photographs, while texture may be difficult to judge from an image. These limits matter when comparing a teaching example with a real concern.
Ask how the finding developed
An evaluation considers how long a change has existed, whether it has spread and whether itching or pain is present. Medicines, exposures and other health information can be relevant. Examination may extend beyond a single location. A photograph provides one moment and one perspective; it cannot substitute for the history, examination or investigations that a particular concern may require.
The course of a skin change adds information that a single picture cannot show. A history can distinguish something newly appearing from a long-standing feature that has altered. Symptoms, relevant exposures and medicines help give the observation context. The aim is a clear account for assessment, rather than using one feature to select a diagnosis or treatment without the rest of the information.
Understand what additional evidence can provide
Some skin concerns need further assessment or a sample. Biopsies involve removing skin tissue from the patient to have it examined in a laboratory. Results will be reviewed by the doctor based on the results of the biopsy along with other information obtained during the history and physical examination. Not all changes to your skin result in a biopsied skin specimen. In a clinical teaching case, determine what can be described visually (or through description), and what would need to be verified through some form of testing. Do not treat an image match as proof.
A laboratory sample answers a particular question about the tissue examined. The result does not remove the need to consider where the sample came from or why it was taken. In a teaching case, connect the report to the examination findings and the history provided. If important context is absent, identify that gap instead of making an image or sample carry more certainty than it can support.
Check your understanding
A short quiz, with an explanation after each answer.
Which layer is outermost?
Practise writing a neutral description of a labelled teaching example. Include location, size, shape and surface, then identify what history is missing. For your own new, changing or concerning skin lesion, seek a clinical assessment rather than using a learning image to diagnose it.