Presents as perfectly smooth, round or oval patches of non-scarring hair loss on an otherwise normal-appearing scalp.
Hair loss associated with distinct, slightly elevated, and sometimes boggy follicular papules or plaques due to mucin deposition.
Distinguished by the complete, non-scarring loss of all scalp hair, while sparing body hair.
The most severe form, characterized by the complete non-scarring loss of all hair on the entire body, including scalp, eyebrows, and lashes.
Abrupt and extensive hair shedding that occurs within days to weeks of an event like chemotherapy, with tapered or fractured hair shafts visible.
A form of scarring alopecia that uniquely begins on the central scalp (vertex) and spreads outwards in a slow, centrifugal pattern.
A less common pattern of alopecia areata presenting as sudden, diffuse thinning of scalp hair without the classic well-defined patches.
A scarring alopecia characterized by erythematous, atrophic plaques with adherent scale, follicular plugging, and telangiectasias.
A rare, suppurative scarring alopecia with painful, boggy nodules and abscesses on the scalp that form interconnecting sinus tracts.
Progressive, diffuse thinning of hair over the central scalp with a characteristic preservation of the frontal hairline, creating a "Christmas tree" pattern.
A scarring alopecia defined by expanding patches of hair loss with tufts of multiple hairs emerging from a single follicular opening and pustules at the active border.
A distinctive scarring alopecia marked by a progressive, band-like recession of the frontotemporal hairline and often loss of eyebrows.
Hair loss is diffuse and characterized by coarse, dry, brittle, slow-growing hair, often with loss of the outer third of the eyebrows.
Presents as a diffuse, non-scarring hair thinning and increased shedding (telogen effluvium) without specific scalp changes.
A severe, inflammatory fungal infection of the scalp presenting as a single, boggy, pustular, and exudative mass with significant hair loss.
A scarring alopecia distinguished by perifollicular erythema (redness around the hair follicle) and fine scaling at the edge of active hair loss patches.
A rare condition where the scalp feels thick, boggy, or spongy due to increased subcutaneous fat, leading to associated hair loss.
A form of cutaneous tuberculosis that can cause reddish-brown, "apple-jelly" nodules on the scalp, leading to ulcerative lesions and scarring alopecia.
The most common hair loss in men, following a distinct pattern of bitemporal recession and thinning at the vertex (crown).
A localized form of scleroderma presenting as a linear or plaque-like band of hardened, ivory-colored, hairless skin (en coup de sabre).
An end-stage scarring alopecia presenting as multiple, small, discrete, smooth, skin-colored, atrophic patches of hair loss resembling "footprints in the snow".
Non-scarring hair loss that occurs directly within the boundaries of thick, silvery-scaled psoriatic plaques on the scalp.
Systemic lupus erythematosus can cause a non-scarring, diffuse hair thinning, or a characteristic "lupus hair" which is fine, brittle, and broken along the frontal hairline.
A gradual, diffuse thinning of hair across the entire scalp in the elderly that does not follow a specific pattern.
A skin cancer on the scalp that destroys hair follicles, leading to a localized, ulcerative, crusted, and non-healing sore with hair loss.
Secondary syphilis causes a characteristic "moth-eaten" pattern of patchy, non-scarring alopecia with multiple, small, irregular areas of hair loss.
A common cause of diffuse, non-inflammatory, non-scarring hair shedding from the entire scalp, identified by a positive hair pull test.
A fungal infection of the scalp (tinea capitis) that causes scaling, itching, and patches of hair loss with characteristic broken "black dot" hairs.
Hair loss caused by and localized to areas of prolonged tension, most commonly appearing as a receding hairline with follicular inflammation and "fringe" hairs.
A psychiatric disorder resulting in bizarrely shaped patches of hair loss containing broken hairs of varying lengths and a coarse feel from new growth.
