Onset usually 1st/2nd trimester
Types:
Eczema
Flexural surface distribution
Prurigo of pregnancy
Erythematous papules and nodules on the extensor surfaces of the extremities  but often also affects abdomen
Pruritic folliculitis of pregnancy
Scattered follicle-based papules & pustules usually start on abdomen
Treatment: emollients and topical corticosteroids
No known risk to fetus
Eczema
Flexural surface distribution
Prurigo of pregnancy
Erythematous papules and nodules on the extensor surfaces of the extremities  but often also affects abdomen
Pruritic folliculitis of pregnancy
Scattered follicle-based papules & pustules usually start on abdomen
Flexural surface distribution
Erythematous papules and nodules on the extensor surfaces of the extremities  but often also affects abdomen
Scattered follicle-based papules & pustules usually start on abdomen
Onset in 2nd/3rd trimesters
LFT abnormalities
Rash non-specific but often pruritis of hands/feet
Pruritus distinguishes it from HELLP syndrome
Treatment: consider starting ursodiol in consultation with OB/GYN
Risk to fetus: prematurity, neonatal respiratory distress
Most common pregnancy-specific dermatosis
Onset in last weeks of pregnancy
Intense pruritus, often associated with striae
Rash usually begins on abdomen
Treat with mid- to high-potency topical steroids (e.g. Betamethasone or Triamcinolone)
No associated risk to fetus
Only occurs in 1st pregnancy
Also called Polymorphic Eruption of Pregnancy (PEP)
Autoimmune disorder
Onset: 2nd/3rd trimester
Rash: pruritic papules and vesicles with bullae, usually starts periumbilical
Treatment: High-potenecy topical steroids +/- prednisone (0.5mg/kg/day) and oral antihistamines
Risk: fetal prematurity
Onset: 3rd trimester
Rash: painful pustules, usually start on thighs
Management: admit to OB/GYN for fetal monitoring
Risk: fetal morbidity
No recent exposure to meds distinguishes it from AGEP
Rashes of pregnancy
Onset usually 1st/2nd trimester
Vaginal bleeding in pregnancy 
Types:
Abdominal pain in pregnancy
Eczema
Septic abortion
Flexural surface distribution