eMedicine Specialties > Dermatology > Diseases of the Adnexa
Perifolliculitis Capitis Abscedens et Suffodiens
Updated: Mar 23, 2009
Introduction
Background
Perifolliculitis capitis abscedens et suffodiens (PCAS) is a therapeutically challenging suppurative scalp disease of unknown etiology. Spitzer first described the disease in 1903, and Hoffman named it descriptively in 1907 (suffodiens is from the Latin suffodio, meaning to dig under).1,2 It predominantly occurs in black males in their second-to-fourth decade of life. The clinical course is chronic and unpredictable with relapses, although spontaneous resolution may occur.3,4,5
Pathophysiology
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) can be associated with acne conglobata, hidradenitis suppurativa, and pilonidal cysts, with follicular blockage as the proposed common mechanism. As retention of material dilates follicles and causes them to rupture, keratin and organisms from the damaged hair follicles can initiate a neutrophilic and granulomatous response. Bacterial infection appears to be a secondary event, not an etiologic factor in the pathogenesis.3,6,7
Frequency
International
No data are available, but the disease is uncommon.
Mortality/Morbidity
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) is not life threatening, but it is chronic and relapsing and can be complicated by squamous cell carcinoma.
Race
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) is found most commonly in black men, but white persons are also affected.
Sex
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) is found mostly in men, although cases in women are also reported.
Age
The most common age group affected is those aged 18-40 years.
Clinical
History
- Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) begins as a simple folliculitis, most often of the vertex and/or occiput, with clusters of perifollicular pustules rapidly followed by abscess and sinus formation.
- Nodules range from a few millimeters to several centimeters in diameter and may be firm or fluctuant.
- Seropurulent fluid may be expressed from fluctuant nodules.
- Lesions at different stages may persist for years, healing with a scarring alopecia.
- Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) has a strong tendency for recurrence.
- No systemic symptoms are usually evident.
Physical
- Vertex and occipital regions of the scalp are sites most often affected by perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp).
- The main physical signs, depending on the disease stage, are perifollicular pustules, tender nodules (some discharging pus or a jellylike substance), intercommunicating sinuses between nodules, and patchy alopecia with scarring.8,9,10
Side view of patient in Media File 1. Black man with painful cutaneous nodules and patchy alopecia, characteristic of dissecting cellulitis.
A white patient with painful nodules. Image used with permission from Medical Science Monitor, 2000, 6(3): 602-4.
Same white patient as shown in Media File 3 after 3 months of isotretinoin treatment. Image used with permission from Medical Science Monitor, 2000, 6(3): 602-4.
- Shedding hair from the surface of nodules and sparing in between the inflamed areas can be observed.
- Regional lymphadenopathy is rarely noted.
- Spondyloarthropathy has been reported in patients with perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp).11,12
Causes
The cause of perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp) is not known.
- The hypothesis is that blockage of follicles, retention of contents, and subsequent rupture leads to inflammation. Acne conglobata, hidradenitis suppurativa, and pilonidal cysts are frequent concomitant diseases, often referred to as the follicular occlusion triad or tetrad.
- Bacterial infection is probably secondary in the course of the disease because most bacteriological cultures are negative. The most frequently isolated pathogens are Staphylococcus aureus, Staphylococcus epidermidis, and Staphylococcus albus.
- Keratosis-ichthyosis-deafness syndrome has been reported in association with the follicular occlusion triad in 2 patients.13,14
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References
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Spitzer L. Dermatitis follicularis et perifollicularis conglobata. Dermatol Zeitschrift (Berlin). 1903;10:109-20.
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Further Reading
Keywords
perifolliculitis capitis abscedens et suffodiens, dissecting cellulitis of the scalp, PCAS, Hoffman disease, Hoffman's disease, dissecting cellulitis, scalp cellulitis, acne conglobata, hidradenitis suppurativa, pilonidal cysts








Overview: Perifolliculitis Capitis Abscedens et Suffodiens