In this study linea nigra
and melasma gravidarum was observed in 64.5% and 63.5% of study population, respectively.
4: PIGMENTARY CHANGES IN PREGNANCY (PHYSIOLOGICAL) (N = 300) Pigmentation Primi Percentage Multi Percentage (n=153) (%) (n=147) (%) Melasma 36 23.52 54 36.73 Areola & Nipple 90 58.82 114 77.55 Linea nigra
123 80.39 138 93.87 Genitalia 42 27.45 63 42.85 Naevi, Freckles 6 3.92 0 0 Pigmentary 6 3.92 0 0 demarcation lines * Pigmentary changes were seen more in multigravida, Linea nigra
was seen in 87% followed by pigmentation of areola & nipple(68%) and melasma (30%).
Several other studies have reported physiological changes in upto 100% cases.8,9 Pigmentary changes were noticed in all the cases.3 Striae were found to be the commonest physiological change (87.7%) closely followed by linea nigra
(85.3%) and areolar hyperpigmentation (82.1%).
In court papers and during a pretrial hearing, the defense lawyers cited two studies published in medical journals that the attorneys said raised questions that the linea nigra, stretch marks and cervical appearance are medically proven indicators of pregnancy.
When they did so, Edwards noted that the linea nigra study subjects were all Nigerians, a population known for "hyperpigmentation" of skin in many parts of the body.
In pigmentary conditions linea nigra (86.6%), secondary areola (74.3%) and melasma (44%) were most common.
Physiologic skin changes in pregnancy include changes in pigmentation (in the form of melasma, linea nigra, secondary areola, localized or generalized hyperpigmentation), vascular system (such as palmar erythema, spider angiomas, varicosities), striae distensae and endocrine function, as well as, changes in hair and nails.