According to the pattern the following forms are seen: patchy AA, round or oval patches of hair loss (most common); reticular AA, reticulated pattern of hair loss; ophiasic band like AA, hair loss in
parieto- temporo-occipital scalp; ophiasis inversus, a rare band like pattern of hair loss in fronto-parieto-temporal scalp; and diffuse Alopecia Areata, a diffuse decrease in hair density.