Trichoscopy

Overview of trichoscopy in dermatology

Trichoscopy

Trichoscopy image showing alopecia areata

Trichoscopy is a non-invasive diagnostic method used in dermatology to examine the hair and scalp. It is a form of dermoscopy specifically applied to the scalp and hair, allowing for the visualization of hair shaft abnormalities, scalp conditions, and hair follicle disorders.

History

Trichoscopy has evolved from the broader field of dermoscopy, which was initially developed for the examination of skin lesions. The adaptation of dermoscopy techniques to the study of hair and scalp has provided dermatologists with a powerful tool for diagnosing various hair disorders.

Technique

Trichoscopy involves the use of a dermatoscope, a handheld device equipped with a magnifying lens and a light source. The device is placed directly on the scalp or hair, and images are captured for analysis. The magnification typically ranges from 10x to 70x, allowing for detailed examination of hair and scalp structures.

Applications

Trichoscopy is used to diagnose a variety of hair and scalp conditions, including:

• Alopecia areata
• Androgenetic alopecia
• Telogen effluvium
• Tinea capitis
• Psoriasis of the scalp

Alopecia Areata

In cases of alopecia areata, trichoscopy can reveal characteristic features such as "exclamation mark" hairs, yellow dots, and black dots. These findings help differentiate alopecia areata from other forms of hair loss.

Androgenetic Alopecia

Trichoscopy can identify miniaturized hair follicles and a variation in hair shaft diameter, which are indicative of androgenetic alopecia.

Advantages

Trichoscopy offers several advantages over traditional diagnostic methods:

• Non-invasive and painless
• Provides immediate results
• Allows for the monitoring of treatment progress

Limitations

While trichoscopy is a valuable tool, it has limitations. It requires expertise to interpret the findings accurately, and it may not replace the need for a biopsy in certain cases.

Related pages

• Dermoscopy
• Alopecia
• Hair follicle
• Scalp