Potential frostbite on legs? Please help.

F23. I was outside for about an hour in 15 degree weather (F) and snow soaked thru the front of my pants. I went in since I started experiencing numbness, which has receded. I took a warm shower but I’m still experiencing tingling, redness, and something akin to a rash. I’ve seen only mild improvements (less blotchy) in about 45 minutes indoors after a warm shower. Do I need to seek further medical attention or will this resolve itself?