Does this look infected? Tattoo

Im worried that this one line of my tattoo is infected, its very red underneath and has quite a thick scab. Everywhere else is pretty much healed except that one spot. (Doctors and tattoo parlour are closed up for the night or i would ring and ask for advice) ive followed all aftercare instructions and have many other tattoos but this is the first ive experieced this. What should i do?