About 2 mm long black bug, crawling on the book in the morning, bleeding red after pinching. I'm afraid it's ticks. Please answer if it is poisonous.

According to the information you provided, this 2 mm long black bug may be a midge, not a tick. Midges are common insects, which usually breed indoors or outdoors. They have the habit of sucking blood and can spread diseases, such as filariasis and malaria.

Because midges can spread diseases, it is suggested to pay attention to hygiene and wash hands and disinfect in time after contact with midges. If you have discomfort symptoms such as pain, redness and swelling after being bitten, you should seek medical advice promptly.

It should be noted that ticks are generally larger than midges and usually do not move in books. If you are worried about ticks, you can observe their appearance and characteristics, or consult a professional for confirmation.