Physiological Skin Changes in Pregnancy
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Direct answer
Physiological skin changes in pregnancy are driven mainly by oestrogen, progesterone and melanocyte-stimulating hormone. They include melasma, linea nigra, striae gravidarum, spider naevi, palmar erythema and altered hair growth. Most are harmless, and the majority fade after delivery, although striae persist as white lines. Clinicians must recognise these changes so that they are not mistaken for disease.
What you must remember
- Melasma: brown patches on the cheeks, forehead and upper lip, worsened by sunlight and partly fading after delivery.
- Linea nigra: midline pigmentation from the pubis towards the umbilicus, a normal change rather than a lesion.
- Striae gravidarum: pink to purple striae on the abdomen, breasts and thighs that fade to white atrophic lines but do not disappear.
- Vascular change: spider naevi and palmar erythema from raised oestrogen, both regressing after delivery.
- Hair growth: prolonged anagen in pregnancy means less shedding, and postpartum telogen effluvium typically follows a few months after delivery.
- Sweating and warmth: increased sweating and skin warmth are expected, and they are not a sign of infection or thyroid disease alone.
- Warning sign: new pruritus or rash in pregnancy must trigger a search for pruritic dermatoses, including intrahepatic cholestasis.
- Sun protection: it is the first-line measure for melasma, since many topical agents are avoided in pregnancy.
Which changes resolve and which persist
Pregnancy changes the skin through several hormonal and mechanical routes, and each has a different course after delivery. The table groups the common changes by mechanism and expected outcome.
| Change | Main mechanism | After delivery |
|---|---|---|
| Melasma | Oestrogen and MSH increase melanin | Often fades, may persist |
| Linea nigra | Hormonal melanin stimulation | Fades over weeks to months |
| Striae gravidarum | Stretching and hormonal change | Fade to white lines |
| Spider naevi and palmar erythema | Raised oestrogen | Regress |
| Hair growth | Prolonged anagen | Telogen shedding follows |
Most of these changes are reassuring, and the exam expects you to name them without reaching for treatment. The striae are the exception that persists, while postpartum shedding is temporary but can alarm patients, so counselling matters as much as therapy.
Timing is the practical discriminator. A change that appears in pregnancy and follows the expected pattern is physiological, whereas a change that spreads quickly or comes with itch, jaundice or fever is not.
Where the exam tries to catch you
Stems test whether you can separate expected pregnancy changes from disease and choose safe management.
- Trap: treating melasma with aggressive topical depigmenting agents in pregnancy. Correct: sun protection comes first, and treatment choices are guided by obstetric advice because many agents are avoided.
- Trap: calling postpartum hair loss permanent alopecia. Correct: postpartum telogen effluvium is temporary shedding that usually resolves over several months.
- Trap: attributing a new itchy rash in pregnancy to normal change. Correct: pruritus, especially on the palms and soles, needs a workup that includes liver tests and serum bile acids.
Frequently asked questions
Why does melasma appear in pregnancy?
Melasma appears in pregnancy because oestrogen, progesterone and melanocyte-stimulating hormone increase melanin production in pigment-prone skin. Sun exposure worsens it, and it often fades after delivery but may persist in some women.
Which skin change in pregnancy fades to white lines?
Striae gravidarum, the stretch marks of pregnancy, fade from pink or purple to white atrophic lines but do not disappear completely. They commonly appear on the abdomen, breasts and thighs during pregnancy.
When does postpartum hair loss start after delivery?
Postpartum telogen effluvium typically begins a few months after delivery. The prolonged anagen growth of pregnancy returns to a normal cycle and sheds, and the shedding is usually self-limiting over several months.
Which pregnancy skin condition causes itch without rash?
Intrahepatic cholestasis of pregnancy causes itch without a primary rash, typically on the palms and soles in the later pregnancy. Raised serum bile acids confirm the diagnosis, and the condition carries fetal risk, so testing is essential.