so my son stunned his toe or something and it’s kind of detaching from the top where he hurt it. any…

so my son stunned his toe or something and it’s kind of detaching from the top where he hurt it. any suggestions of what i can do for him? i obviously need to take the nail off. but only the top looks damaged. what should i do? i sprayed the antiseptic on it to numb it. but he’s still cranky.