מדרש אויף ויקרא 21:21

1) (Vayikra 21:21) ("Every man in whom there is a blemish, of the seed of Aaron the Cohein, shall not come near to offer up the fire-offerings of the L–rd. There is a blemish in him; the bread of his G d he shall not come near to offer up.") This tells me only of these (i.e., the aforementioned blemishes). Whence are the other blemishes derived? From "in whom there is a blemish, of the seed of Aaron the Cohein." (i.e., only those who bear a normal human semblance may serve.)

2) Whence is derived (for inclusion) (one with the skin-coloring of) a Cushite, one who is red-spotted, one who is white-spotted, one who is pole-like in appearance (i.e., unusually long and thin), one who is dwarf-like, a deaf-mute, an imbecile, and those with (halachically) clean plague-spots? From "Every man."

3) (For without "every" we would say:) Does it not follow a fortiori, (that all of the aforementioned (#2) should be permitted in a Cohein), viz.: If a beast, which is unfit (for consummation) in the instances of "it and its son" (Vayikra 22:28), are treifah (organic defect) and Caesarian section, is kasher in all of the aforementioned instances,