L Shape on the top/back of my head.

Has anyone ever had this? I have this split in the left middle of my head, it goes down into my whorl area where that is more of a circle shape and it looks like it makes a "L" type shape. Could this be a pattern of mpb? Just kind of concerned that this could maybe form a "u' shape & maybe swallow up the hair in the middle, if this is possible? Looking at nw scales and it looks like a spot in the back evolves out and eventually meets the hairline so not sure if it actually outline itself & again, swallow up the inside hair. Thank you