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Dermatology

Seborrhoeic dermatitis

 

What is seborrhoeic dermatitis?

Seborrhoeic dermatitis (American spelling is ‘seborrheic’) is a common, chronic or relapsing form of eczema/dermatitis that mainly affects the scalp and face. There are infantile and adult forms of seborrhoeic dermatitis. It is sometimes associated with psoriasis (sebopsoriasis). Seborrhoeic dermatitis is also known as seborrhoeic eczema.

Dandruff (also called ‘pityriasis capitis’) is an uninflamed form of seborrhoeic dermatitis. Dandruff presents as bran-like scaly patches scattered within hair-bearing areas of the scalp.

 

What causes seborrhoeic dermatitis?

The cause of seborrhoeic dermatitis is not completely understood. It is associated with proliferation of various species of the skin commensal Malassezia in its yeast form. Its metabolites cause an inflammatory reaction. Differences in skin barrier function may account for individual presentations.

 

Who gets seborrhoeic dermatitis?

Infantile seborrhoeic dermatitis affects babies under the age of 3 months and usually resolves by 6–12 months of age.

Adult seborrhoeic dermatitis tends to begin in late adolescence. Prevalence is greatest in young adults and in the elderly. It is more common in males than in females. The following factors are sometimes associated with severe adult seborrhoeic dermatitis:

 

  • Oily skin (seborrhoea)
  • Familial tendency to seborrhoeic dermatitis or a family history of psoriasis
  • Immunosuppression: organ transplant recipient, human immunodeficiency virus (HIV) infection and others
  • Neurological and psychiatric diseases: Parkinson disease, tardive dyskinesia, depression

What are the clinical features of adult seborrhoeic dermatitis?

Seborrheic dermatitis is thought to be due to an inflammatory reaction against Pityrosporum ovale (called Malassezia furfur when in the infectious hyphal form),a yeast that is part of normal skin flora.  The incidence of seborrheic dermatitis is associated with increased sebaceous gland activity and is found most commonly in infants and in post-pubertal patients.

Typical features include:

  • Winter flares, improving in summer following sun exposure
  • Minimal itch most of the time
  • Combination oily and dry mid-facial skin
  • Ill-defined localised scaly patches or diffuse scale in the scalp
    • Blepharitis: scaly red eyelid margins
    • Salmon-pink, thin, scaly, and ill-defined plaques in skin folds on both sides of the face
    • Petal or ring-shaped flaky patches on hair-line and on anterior chest
    • Rash in armpits, under the breasts, in the groin folds and genital creases
    • Superficial folliculitis (inflamed hairfollicles) on cheeks and upper trunk

 

 

 

DermNet New Zealand

 

Ailesbury Dublin

David Lloyd Riverview,

1st Floor,

Beech Hill Road,
Donnybrook  Dublin 4.

Eircode DO4 AF10 (Google Map)

Tel:   (01)269 2255 / 2133

Email:reception@ailesburyclinic.ie

Fax: (01) 218 0857 

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Ailesbury Cork

Holbar House  

East Village Medical Cntre

Douglas, Cork 

Eircode T12 HK2C (Google Map)

Tel:   (01)269 2255 / 2133

Email:reception@ailesburyclinic.ie

Fax: (01) 218 0857

 

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Congratulations to our own Ailesbury Doctor Dr Olga O' Driscoll coming 1st out of 100 doctors in the St. Mary's Diploma in Aesthetic Medicine and securing a mentorship under Dr. Adriano Santorelli in Naples.

 

Ailesbury Galway                   

 

Tel:   (01)269 2255 / 2133

Galway (091)568 555

Email:reception@ailesburyclinic.ie

Fax: (01) 218 0857

 

Specialists in Dermatology and Aesthetic Medicine. We perform minor surgery + skin cancer screen. VHI, Aviva, Laya and Irish Health accepted. Hstopathology is covered by private insurance and performed by dedicated skin histopathologists at St. Vincent's University Hospital, Dublin. Consultation €100  READ MORE 

 

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