Question 1

Why do scars form instead of the skin going back to normal?

Accepted Answer

Because adult skin repairs rather than regenerates, and speed is prioritised over fidelity.

Normal skin has collagen arranged in a **basket-weave pattern** — fibres running in many directions, which gives skin its strength in every direction plus its flexibility. It also contains hair follicles, sweat glands, sebaceous glands and elastin.

When a wound extends into the dermis, the body's priority is closing the breach quickly, because an open wound is an infection risk that could kill you. Fibroblasts flood the area and lay down **type III collagen** fast and in parallel bundles, aligned along the lines of tension rather than woven. Over the following months this remodels into stronger type I collagen, but it retains the parallel alignment.

**That alignment is the scar.** Parallel collagen reflects light differently, which is why scars look shiny and a different colour. It is less flexible, which is why scars feel tight. And the regenerative structures do not come back — **a scar has no hair follicles, no sweat glands and no sebaceous glands**, which is why scarred skin does not sweat or grow hair.

**Why we cannot do better:** foetuses in early gestation heal without scarring, and so do some other animals, so scar-free repair is biologically possible. It appears to depend on a different inflammatory environment. Adults trade perfect repair for speed and infection control.

**Scars keep changing for a long time.** Remodelling continues for a year or more, and most scars fade and flatten considerably. Judging a scar at six weeks is premature.

**Abnormal scarring** — raised **hypertrophic** scars, or **keloids**, which grow beyond the original wound — is more common in some people and some body sites, and treatments exist. Worth discussing with a clinician rather than treating at home.

Question 2

Should you cover a cut or let it breathe?

Accepted Answer

Cover it. The advice to let wounds "breathe" and form a hard scab is widely repeated and contradicted by decades of wound healing research. Why covering works better. The key concept is moist wound

Question 3

Why do cuts itch as they heal?

Accepted Answer

Itching during healing is usually a sign the repair process is active, and several mechanisms contribute at once. Histamine release. During the inflammatory and proliferative phases, immune cells

Question 4

What is eczema, and what actually helps?

Accepted Answer

A condition in which the skin's barrier function is impaired, allowing moisture out and irritants and allergens in, producing inflammation, itching and dryness — and understanding it as a barrier

Question 5

How does rehabilitation after surgery or injury work?

Accepted Answer

By progressively loading tissue so it adapts and recovers function — and the modern approach is substantially more active and starts substantially earlier than the rest-and-wait model most people

Question 6

What is inflammation and why is it not always bad?

Accepted Answer

Inflammation is the immune system's response to damage or threat. It is fundamentally protective — the problem is not inflammation itself but inflammation that does not switch off. Acute inflammation

Question 7

Why does a bruise change colour as it heals?

Accepted Answer

The colour sequence is your body dismantling the haemoglobin that leaked out of broken blood vessels, and each shade corresponds to a different breakdown product. A bruise forms when blunt impact

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