The Hamilton male pattern baldness classification system
In 1951, anatomist James B. Hamilton proposed the first broadly usable scheme for grading the extent of male pattern baldness (androgenetic alopecia, AGA). He organized…
Measuring Scalp Sebum: Principles, Quantification Techniques and Dermatological Relevance
Sebaceous glands are holocrine units that synthesise and excrete a complex lipid mixture – sebum – onto the surface of skin and hair. On the…
Hair Weathering: Mechanisms, Causes, and Prevention
Hair weathering refers to the progressive chemical or physical deterioration of the hair shaft, leading to the loss of structural components and increased susceptibility to…
From Victorian Alarm to Twenty-First-Century Fashion: The Shifting Meaning of the Beard
When men stop shaving, others start talking. Across the past two centuries journalists, preachers, physicians, and social-media influencers, have treated facial hair as a barometer…
How Fast Does Hair Turn Grey As We Age ?
Few biological changes announce themselves as clearly – or as emotionally – as the first silver strands of hair on the temples. How quickly those…
Understanding the Human Hair Growth Cycle
Human scalp hair does not grow continuously from birth to old age. Instead, every hair follicle runs through a repeating cycle of growth, regression, and…
Physical Injury Induced Alopecia: An Overview on Hair Loss after Burns, Frostbite and Prolonged Pressure
Hair looks deceptively tough, yet each shaft emerges from a remarkably delicate “mini‑organ” embedded in the skin. Humans are born with a set number of…
Hair Density: What It Really Means, How It’s Measured, and Why It Changes
When people talk about “thick” or “thin” hair, they are usually describing hair density – that is, the number of visible hair shafts emerging from…
Grey Hair in Children: Understanding an Uncommon but Important Phenomenon
Few changes startle parents quite as much as spotting silver strands on a young head. While grey hair is widely accepted as a normal sign…