Hairless Spots on My Leg — Alopecia Areata?

Hi Dr Rassman, I have 2 round, completely hairless bald spots on my leg, very slightly pitted & ridged fingernails, and some hair loss on the sides of my head. I have read a lot about alopecia areata and was relieved to find out that al. areata hair loss is usually in clumps, but then I came across a website that said that there is a type of alopecia areata that is a general thinning of the hair (not talking about dupa), I have also read on this site that there can be several reasons for round hairless patches other than alopecia areata, and lastly I have read that there can be many reasons for pitted fingernails, my question to you is can you tell me the list of tests I should have done to evaluate what I am experiencing? I plan to see a Dr. regarding this as well, but I also wanted to ask your thoughts. Thank you.

You have 2 round and hairless spots on your leg along with pitted and ridged fingernails. Although alopecia areata is frequently seen in clusters, it is not unusual to see just one area involved. Accompanying signs like pitting and ridging fingernails are found in alopecia areata (AA), but it can also be found in fungal infections as well. It is a good idea to see a dermatologist and if presenting typical signs, you may not need any other tests. If AA has an unusual presentation, your doctor may choose to take a skin biopsy to confirm the diagnosis.