Polymorphous Light Eruption

Polymorphous light eruption (PMLE) is included here, although opinion is divided as to whether it is in fact related to lupus erythematosus. PMLE is characteristically seasonal (spring or summer), implying a threshold or dose-response relationship. It most commonly affects children or young adults ( Fig.30-6).

Skin Photosensitivity

Figure 30-6. Photosensitivity dermatoses. Papular polymorphic light eruption off and on for 15 years. ( Texas Pharmaceutical)

The skin lesions, as the name implies, are variable, with papules and vesicles being most common. Plaques, wheals (solar urticaria may be related to PMLE), and petechiae sometimes occur (solar purpura also may be a related condition). Subjective symptoms are less severe than those of protoporphyria. When blisters are prominent, hydroa (aestival vacciniform) is the term often applied ( Fig 30-7).

Figure 30-7. Photosensitivity dermatoses. (Texas Pharmaceutical)

Figure 30-7. Photosensitivity dermatoses. (Texas Pharmaceutical)

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