complexion

From a certain point of view, it really doesn't matter. And there are actually other texts which give alternative descriptions. But it is still interesting that this sort of description exists in the hadith.

Bukhari, Volume 4, Book 55, Number 650:
Narrated Salim from his father:

No, By Allah, the Prophet did not tell that Jesus was of red complexion but said, "While I was asleep circumambulating the Ka'ba (in my dream), suddenly I saw a man of brown complexion and lank hair walking between two men, and water was dropping from his head. I asked, 'Who is this?' The people said, 'He is the son of Mary.' Then I looked behind and I saw a red-complexioned, fat, curly-haired man, blind in the right eye which looked like a bulging out grape. I asked, 'Who is this?' They replied, 'He is Ad-Dajjal.' The one who resembled to him among the people, was Ibn Qatar." (Az-Zuhri said, "He (i.e. Ibn Qatan) was a man from the tribe Khuza'a who died in the pre-lslamic period.")