it is very common for a woman to get stretch marks after delivering a baby. In some women, they may look lighter and in some they just stand out. This depends and varies with every woman. Many women start using creams or oils (such as Bio-Oil) from 2nd trimester to prevent/reduce stretch marks.
Darker inner thighs, though not any medical condition, it can be bothersome for some individuals and for some; it can dent their confidence when spending intimate time with their partner. Darkening of inner thighs is caused due to over pigmentation of melanin, the pigment that gives colour to human body/skin (called hyperpigmentation). People who are overweight or obese can also see their inner thighs darken as they rub against each other when they walk/run. In some people, hyperpigmentation can spread to the front side of thighs, groin area and to the butts.
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