Seborrheic dermatitis

Seborrheic dermatitis

Seborrheic dermatitis (SD) is associated with infection by the fungus Malassezia, which is found in healthy skin.15 Excluding dandruff, SD affects 1-5% of the general population, with 3-5% of these people being young adults.15 

In babies, SD typically appears by 3 months of age but clears within weeks.5,10,16,17 During the first few months of life, SD may appear as one of the following:

  • Cradle cap: red-yellow plaques coated by thick greasy crusted scales on the scalp 
  • Edges of the face and behind the ears: salmon red plaques
  • Moist, shiny non-scaly patches on the neck, armpits or groin and nappy area (nappy rash)

In toddlers, lesions most often appear on the surfaces of arms and legs on the opposite sides to the joints, sometimes with oozing and crusting. In older children, involvement of the body creases, neck and hands is more common, and can be accompanied by dry skin.5,10,16,17

Cradle Cap

Image source: DermnetNZ

References

For a full list of this sections references click here 

UK/GEN/16/0051 Date of preparation: October 2016