28 years old with thinning hair and a receding hairline. Any suggestions? (photos)

Propecia is an option. There are also other options you could use: I have great success in my practice using injectable progesterone and prp to the scalp. A transplant is another option. I suggest you see a cosmetic dermatologist who specializes in hair loss for a formal consultation. Best, Dr. Emer

you have a norwood 3 A type loss ..no need to take propecia for years to reverse the loss. 

I advise you to have a FUE operation of 3000- 3500 grafts  (I mean approx. 8000-9000 hair shaft ) to cover all vertex area , create a new hair line in one session of operation...you would have a good, succesfull result . 

You have a Class 3 Vertex balding pattern which impacts the crown and the frontal hairline with some recession. A hair transplant is a good option