Androgenetic Alopecia

Androgenetic alopecia (AGA) is the most common form of hair loss worldwide, affecting at least 50% of men and approximately 30% of women, with prevalence increasing with age. The condition is characterized by progressive miniaturization of hair follicles and reduction in the number of active follicles, resulting in a characteristic pattern of hair thinning. While AGA is a benign condition, it carries significant psychosocial burden, negatively affecting self-esteem, mood, and quality of life in affected individuals.

Causes

The pathogenesis of AGA can be multifactorial; genetics, androgen-mediated mechanisms with testosterone being converted to dihydrotestosterone (DHT), microinflammation, oxidative stress, and microbiome alterations.

Clinical Features

-Male Pattern

Men present with asymptomatic hair loss involving the frontal-temporal regions and vertex. Examination reveals miniaturization of follicles and hair loss in these characteristic areas, progressing in a defined pattern.

-Female Pattern

Female pattern AGA is characterized by diffuse thinning predominantly in the vertex with relative preservation of the frontal hairline. The condition typically affects postmenopausal women, though premenopausal women and rarely prepubescent individuals can be affected.

Histological Features

Histologically, AGA exhibits progressive hair follicle miniaturization (terminal-to-vellus conversion) and anagen shortening. Terminal follicles undergo a shortened anagen phase and become shorter, thinner vellus follicles, leading to the perception of hair thinning. The condition may be associated with telogen effluvium.

Complications

While AGA is a benign condition from a medical standpoint, the psychosocial complications are substantial and clinically significant.

Affected individual's experience:

·       Diminished self-esteem and reduced confidence

·       Increased anxiety and depression

·       Lower work productivity and quality-of-life scores

·       Significant distress irrespective of age or stage of baldness

Prompt diagnosis and treatment can improve self-reported quality of life. Some studies have also identified associations between AGA and metabolic syndrome, though the clinical significance of these associations requires further investigation.

Diagnosis

The diagnosis of AGA can be made clinically based on sex-specific characteristics and distribution patterns. Dermoscopic examinations can reveal characteristic features of follicular miniaturization and help differentiate AGA from other forms of alopecia. Targeted laboratory testing may be indicated to exclude other causes of hair loss, particularly in women or atypical presentations. Testing may elucidate malnutrition, autoimmune diseases, and endocrine disorders.

Differential Diagnosis

This condition can resemble telogen effluvium (TE) , traction alopecia, alopecia areata, trichotillomania, Lichen planopilaris (LPP), seborrheic dermatitis, or tinea capitis.

Treatment

Traditional therapies include topical minoxidil, oral vitamins, and oral androgen blockers. Emerging treatments for androgenic alopecia include low-level laser therapy (LLLT) and  platelet-rich plasma (PRP), all showing promise as alternatives or adjuncts to traditional therapies.  

Written by Dakota Olberding, PA

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