In this system, the sex of an individual<span> is determined by a </span>pair<span> of </span>sex chromosomes called the <span>gonosomes. Females typically have two of the same kind of </span>sex chromosome <span>(XX) and are called the homogametic </span>sex<span>. Males typically have two distinct </span>sex chromosomes<span> (XY), and are called the heterogametic </span>sex<span>.</span>
She should really have it checked out by a doctor, preferably a dermatologist. It could very well be fine, but it could also be a symptom of a serious medical condition. Those kinds of things tend to differ between individuals, so I suggest she has it examined.
<span>the inner lining of the eyelids which contains many glands that secrete oil and tears, enabling the eye to move freely and easily is the CONJUNCTIVA</span>