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Miscellaneous dermatology

Dermatoses of pregnancy key points test

Pregnancy is associated with an increased prevalence of which of the following dermatoses? # Urticaria # Alopecia areata #! Striae distensae #! Melasma Explanation: Pregnancy may result in an increase in prevalence or severity of atopic dermatitis, psoriasis, acne, perioral dermatitis, telogen effluvium, striae distensae, pyogenic granuloma, telangiectasia and melasma. Prurigo of pregnancy: *! Presents as scratched papules * Commences within striae * Nearly always commences in third trimester * Positive direct immunofluorescence Explanation: Prurigo of pregnancy presents as scattered itchy/scratched papules at any stage of pregnancy and most often affects the limbs. Polymorphous eruption of pregnancy: # Presents as bullae #! Commences within striae #! Nearly always commences in third trimester # Positive direct immunofluorescence Explanation: Polymorphous eruption of pregnancy presents during the third trimester with erythematous papules and plaques. Blisters are rare. At first these are confined to abdominal striae. Pemphigoid gestationis: * Presents as scratched papules * Commences within striae * Nearly always commences in third trimester *! Positive direct immunofluorescence Explanation: Pemphigoid gestationis most often starts in the second trimester as blisters and erythematous plaques around the umbilicus. Direct immunofluorescence shows deposition of C3 and or IgG or other antibodies.