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| Pruritic urticarial papules and plaques of pregnancy (PUPPS) or polymorphic eruption of pregnancy (PEP) in the UK | Most common, usually presenting in the last trimester in the striae and sparing the umbilicus (Cobo et al., 2009 [5]) |
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| Bullous pemphigoid (BP) | Usually in elderly, starting on thighs, associated with HLA-DQ3 (Cobo et al., 2009 [5]) |
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| Dermatitis herpetiformis | Usually on extensor surfaces, associated with HLA-DQ2, DIF: IgA deposits (Lipozenčić et al., 2012 [6]) |
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| Erythema multiforme | Target lesions, usually after infection or drug, DIF: IgM deposits (Lipozenčić et al., 2012 [6]) |
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| Cicatricial pemphigoid | Involving mucous membranes |
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| Linear IgA dermatosis | Associated with drug use, commonly vancomycin, DIF: linear IgA deposits |
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| Acute urticaria | Wheal, flare; short duration |
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| Allergic contact dermatitis | Typical linear, Rhus reaction |
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Papular dermatitis of pregnancy
Or prurigo gestationis of Besnier | Usually on proximal limbs, DIF: linear IgM deposits |
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| Pruritic folliculitis of pregnancy | Folliculitis and the DIF being negative |
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| Scabies | Distribution: webs and belt lines and look for mites |
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