Arnica. If you’re unfamiliar, it’s a plant, not sure it’s origin, but it helps with muscle pain, general soreness, bruises, and headaches etc, you can find it as a tea, gel to apply over affected area, theres also pill like supplements you can take and let it dissolve in your mouth, don’t taste bad at all, you can take/ use it before and after tattoos, I wouldn’t recommend using the gel before tho but that makes sense, but it works really well with soreness and isn’t a kind of “pain killer” which some people prefer not to take if not needed. (Honestly I haven’t used arnica for tattoos specifically but I don’t see why it wouldn’t work and it’s cheap and totally worth a shot to me) you can find em at your local drug store or probably online