I'm an 18 year old female. I'm getting bald only in a specific area. What to do? (Photo)

A doctor needs to examine you first. A doctor may ask you questions pertinent to your hair loss taking a medical history. A doctor may even order blood tests or make measurement such as a bulk test or miniaturization test looking at your hair under a microscope. Afterwards, the doctor may give you a diagnosis and explanation of your hair loss condition offering possible treatment plans which may or may not include surgery.

Hair loss can occur in females due to a variety of reasons like the hormonal factors ( female androgenetic alopecia or hypothyroidism), dietary factors or stress as well. It will be better to visit your doctor and undergo a detailed examination to find out the treatment of the same....

You'll want to see a dermatologist for guidance. First, a diagnosis is needed and once a diagnosis is given, treatment can be discussed.  

In most cases, even in females, the cause is a genetic condition called androgenic alopecia, which is when hair follicles shrink because of a loss of estrogen and/or increased sensitivity to testosterone. Unlike men, who tend to experience androgenic alopecia as receding hairlines, women generally get thinning at the temples and the tops of their heads. Once it starts, it usually gets worse, so it’s best to seek treatment earlier on when there’s more hair to save. Androgenic alopecia strikes some 25 percent of women in their 20s and 30s, and more than half of women over 45, when estrogen levels falls. Other diseases include alopecia areata, an autoimmune disorder in which the body attacks the hair follicles, causing patchy round bald spots which impacts less than 1 percent of the population and typically appears in the teen or young adult years. There are many other causes of hair loss in women and these include a variety of autoimmune diseases, dietary problems, hormone problems, etc.. This must be diagnosed by a doctor and you should seek medical advice and get the appropriate testing. A complete discussion of this is in the web reference below which might help you further understand what is happening to you.