Do I have Alopecia areata?

https://imgur.com/a/cWkvO more noticable IRL than the picture

Got a haircut 6 days ago and noticed a bald spot on the back of my head. I looked it up and saw Alopecia areata but all people that had it or the symptoms are a bald patch about the size of a coin. My spot is on the back of my head but it is pencil eraser size/pea size or a little less. I think its a little red but I'm not sure.

Its been here for 6 days with no growth. I don't know if the spots always been here but I'm pretty sure it wasn't because my friends never pointed it out until now