HAIR AND NAIL DISORDERS

Clinical Types of Alopecia

Alopecia is a term used to describe hair loss, which can occur in various forms. The clinical types of alopecia can be categorized into diffuse and localized alopecias, as well as scarring and nonscarring alopecias.

1. Diffuse Alopecias: This type involves a widespread thinning of hair across the scalp rather than in specific patches. Common causes include:
   • Telogen effluvium: Often triggered by stress, illness, or hormonal changes.
   • Androgenetic alopecia: A hereditary condition that affects both men and women, leading to gradual thinning.
2. Localized Alopecias: This type is characterized by hair loss in specific areas. The most common form is:
   • Alopecia areata: An autoimmune disorder where the immune system attacks hair follicles, resulting in round patches of hair loss.
3. Scarring Alopecias: These conditions lead to permanent hair loss due to the destruction of hair follicles and replacement with scar tissue. Examples include:
   • Lichen planopilaris: An inflammatory condition affecting the scalp.
   • Discoid lupus erythematosus: A chronic skin condition that can cause scarring on the scalp.
4. Nonscarring Alopecias: These types do not result in permanent damage to hair follicles and may allow for regrowth. Examples include:
   • Telogen effluvium and alopecia areata fall under this category.

Common Causes of Various Forms of Alopecia

The causes of alopecia vary significantly based on its type:

• Diffuse Alopecias:
  • Telogen effluvium can be caused by factors such as severe stress, nutritional deficiencies (e.g., iron deficiency), medications (e.g., anticoagulants), or hormonal changes (e.g., postpartum).
  • Androgenetic alopecia is primarily influenced by genetic predisposition and hormonal factors, particularly dihydrotestosterone (DHT).
• Localized Alopecias:
  • Alopecia areata has an unclear etiology but is believed to involve genetic predisposition and environmental triggers that provoke an autoimmune response.
• Scarring Alopecias:
  • Conditions like lichen planopilaris may be linked to autoimmune processes or infections.
  • Discoid lupus erythematosus is associated with systemic lupus erythematosus and can be triggered by sun exposure.
• Nonscarring Alopecias generally have reversible causes related to stressors or hormonal imbalances.

Clinical Examination for Patients with Alopecia

A thorough clinical examination is essential for diagnosing alopecia:

1. Hair Examination:
   • Assess the density and distribution of hair.
   • Look for broken hairs, which may indicate trauma or underlying conditions.
   • Evaluate the presence of normal versus abnormal hairs; normal hairs should have a consistent diameter without significant breakage.
2. Scalp Examination:
   • Inspect the scalp for openings where hair follicles should be present; absence may indicate scarring alopecia.
   • Check for signs of inflammation, scaling, or lesions that could suggest underlying dermatological issues.
   • Palpate the scalp gently to assess tenderness or induration.
3. Documentation: Record findings meticulously to assist in diagnosis and treatment planning.

Diagnostic Approach to Patients with Hirsutism

Hirsutism refers to excessive hair growth in women following a male pattern distribution due to elevated androgen levels or sensitivity:

1. Definition & Mechanisms:
   • Hirsutism is defined as excessive terminal hair growth in areas typically seen in males (face, chest).
   • Underlying mechanisms often involve hyperandrogenism from ovarian or adrenal sources.
2. Diagnostic Workup Based on Clinical Presentation:
   • Differentiate between cutaneous virilization (e.g., hirsutism without other symptoms) versus systemic virilization (e.g., voice deepening, menstrual irregularities).
   • Conduct laboratory tests including serum testosterone levels, DHEAS (dehydroepiandrosterone sulfate), LH/FSH ratios, and possibly imaging studies like pelvic ultrasound if ovarian pathology is suspected.
3. Assessment Tools: Utilize scoring systems like the Ferriman-Gallwey score to quantify hirsutism severity.

Common Causes of Nail Disorders

Nail disorders can arise from various etiologies; three common conditions include:

1. Psoriasis:
   • Characterized by pitting, ridging, discoloration, and separation from the nail bed.
   • Often associated with psoriatic arthritis.
2. Onychomycosis (Nail Fungus):
   • Presents as thickened nails that may appear discolored (yellowish) and brittle.
   • Caused by fungal infections affecting one or multiple nails.
3. Lichen Planus:
   • Nails may exhibit thinning, ridges, or longitudinal splitting.
   • Can also affect skin surfaces leading to characteristic purple papules.

Principles of Treatment for Hair and Nail Problems

Treatment approaches vary based on diagnosis:

1. For alopecia treatments might include topical minoxidil for androgenetic alopecia or corticosteroids for inflammatory conditions like alopecia areata.
2. Scarring forms may require immunosuppressive therapy depending on severity.
3. For hirsutism management could involve hormonal therapies such as oral contraceptives or anti-androgens like spironolactone.
4. Nail disorders often necessitate antifungal treatments for onychomycosis while psoriasis might require topical steroids or systemic therapies depending on severity.

In summary, understanding these aspects allows healthcare providers to effectively diagnose and manage patients presenting with hair and nail disorders comprehensively.