The mutation which gives Karkat's blood its distinctive color also causes his horns to protrude slightly into his skull. This gives then their distinctly 'nubby' appearance, and causes a constant, mild headache.
When Aranea offered to make his headache go away, he had no idea what she was talking about, and declined.
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Homestuck Headcanons
FanfictionHey so yeah read the title and submit some if you would like to! Please tell me if I spelled 'headcanon' wrong ;-; Homestuck belongs to Andrew Hussie Cover and any pictures that I put in the book don't belong to me (unless I drew them).