A number of conditions may be associated with cutaneous pseudolymphoma. Identifying an underlying cause may be challenging, with some cases idiopathic.


T-cell predominant pseudolymphoma:

(1) chronic actinic dermatitis

(2) lymphomatoid contact dermatitis


B-cell predominant pseudolymphoma:

(1) lymphomatoid drug reactions (phenytoin, other)

(2) arthropod bite or insect sting

(3) perniosis

(4) vaccination or other injection

(5) tattoo or body piercing

(6) hirudo medicinalis (medicinal leech)

(7) inflammatory pseudotumor (plasma cell granuloma)

(8) Borrelia burgdorferi infection

(9) acral pseudolymphomatous angiokeratoma


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