Chapter 3: Skin Changes, Bruising, and Unusual Marks

The skin is one of the easiest parts of the body to observe, which means visible changes can sometimes provide an important reason to seek medical advice.

A new mole or a noticeable change in an existing mole deserves attention, particularly when its appearance changes over time. Dermatologists commonly consider features such as asymmetry, irregular borders, multiple colors, increasing diameter, and especially evolution, meaning a noticeable change in the lesion.

However, not every unusual-looking mole is cancerous. Many harmless moles can have irregular characteristics, while some concerning skin cancers may not fit a simple checklist. For that reason, a changing or suspicious skin lesion is best assessed by a healthcare professional.

Unexplained bruising is another symptom that can have many possible causes. Some people bruise easily because of medications, nutritional deficiencies, aging skin, minor injuries they did not notice, or conditions affecting blood vessels or blood clotting. In some circumstances, however, frequent or unusual bruising may be associated with problems involving blood cells or bone marrow.

A person should pay particular attention if bruises appear frequently without a clear explanation, become unusually large, or occur together with other symptoms such as persistent fatigue, recurrent infections, fever, or unusual bleeding.

Changes in skin color can also have numerous explanations. A persistent sore that does not heal, repeated bleeding from a skin lesion, or a lesion that continues changing should be evaluated rather than repeatedly treated at home.

The most useful approach is simple: know what is normal for your skin and notice when something changes.

Taking a clear photograph of a changing spot can sometimes help you document its evolution before seeing a healthcare professional, although a photograph should never replace an examination.

Image 3 — Photo placement

Use a realistic close-but-not-extreme photograph of a European woman in her 40s examining a changing mole on her forearm while standing near a bathroom mirror. Natural skin texture, realistic household lighting, documentary medical-awareness photography, no graphic injury. No text, no logos, no watermark, no arrows, no labels, no medical illustrations.