How is pediculosis differentiated from other scalp conditions?

Updated: Mar 01, 2018
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Many scalp conditions can cause pruritus. Seborrheic dermatitis presents with erythema and scaling. It affects the scalp, eyebrows, nasolabial folds, and central chest. Acne necrotica presents with inflamed follicular papules and pustules, black crusts, and scarring. It is extremely pruritic, and patients usually pick at the lesions.

Free-living primitive psocid lice feed on decaying matter in leaves, old books, and animal habitats. They may cause human scalp infestation in children when they visit a library or doghouse that is infested. Psocids have large heads with massive jaws, large hind legs, and long antennae and are distinguished easily from Anoplura lice. [6]


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