edit: I know it is supposed to be painful/numb, but it is the redness that I'm worried about. I just want to make sure I'm not hurting my thumbs more than I'm supposed to.

TLDR: How do I avoid this, and make my thumbs look like this

M/173lbs/6'0ft/17years old =79kgs/183cm

B/S/D 1RMs: 155< / 225 / 265< (Haven't tested for awhile)

Hey /r/fitness, I've recently had problems with my left thumb because of using the hook grip on deadlifts. I recently switched to hook grip because I was having problems gripping the bar during my working sets, but I found that after my sets, my left thumb was numb/painful and red in a specific area of the skin on my thumb(it isn't the thumb as a whole, just a specific part of my skin), as seen in the pictures(the first picture is one picture of my thumb directly after doing a deadlift set, and the other in the first picture is from a few minutes ago, and it has been a few days since I deadlifted. The second is a picture of my other, healthy thumb a few minutes after doing a deadlift set). However, my right thumb feels and looks fine. Could this be a problem with how I am gripping the bar? How should I? Should I not deadlift/deadlift with hook grip for awhile?