The House on the Borderland by William Hope Hodgson

I awake suddenly. It is still dark. I turn over, once or twice, in my endeavors to sleep again; but I cannot sleep. My head is aching, slightly; and, by turns I am hot and cold. In a little, I give up the attempt, and stretch out my hand for the matches. I will light my candle, and read, awhile; perhaps, I shall be able to sleep, after a time. For a few moments, I grope; then my hand touches the box; but, as I open it, I am startled to see a phosphorescent speck of fire, shining amid the darkness. I put out my other hand, and touch it. It is on my wrist. With a feeling of vague alarm, I strike a light, hurriedly, and look; but can see nothing, save a tiny scratch.

"Fancy! " I mutter, with a half sigh of relief. Then the match burns my finger, and I drop it, quickly. As I fumble for another, the thing shines out again. I know, now, that it is no fancy. This time, I light the candle, and examine the place, more closely. There is a slight, greenish discoloration 'round the scratch. I am puzzled and worried. Then a thought comes to me. I remember the morning after the Thing appeared. I remember that the dog licked my hand. It was this one, with the scratch on it; though I have not been even conscious of the abasement, until now. A horrible fear has come to me. It creeps into my brain -- the dog's wound shines at night. With a dazed feeling, I sit down on the side of the bed, and try to think; but cannot. My brain seems numbed with the sheer horror of this new fear.