Latisse, a prostaglandin promoter, is not likely to have a durable effect on scalp hair because scalp hair cycles are generally more hormone-sensitive, while eyelash hair cycles are prostaglandin-sensitive.
Before advising you on a treatment, I suggest a consultation with a dermatologist for a thorough history and physical exam to first determine the exact type of hair loss. If your “small bald spot” is round and developed rapidly, this may be due to an autoimmune form of hair loss called alopecia areata; the best treatment would then be a steroid injection. If your patch is symmetric on both sides of your temporal hairline, and developed gradually, this is more likely to be hormone-mediated hair loss; the best treatments are rogaine and propecia. If your patch has significant thinning and is stable in size, you should also consider Neograft to directly replace lost hair follicles with new hairs.
I believe stem-cell research along with the development of new technologies will bring exciting opportunities for hair restoration in the next few years. Good luck!