How do you stop swelling under eyebrow?

You're going to have to remove the hair or it will continue to grow within the confines of the follicle, increasing swelling and pain. sometimes there is enough of the offending hair close to the surface that you can snag it with tweezers. Pull it fast. Scream. Say something vulgar to the ingrown hair. Then squeeze the area to blast out any remaining foreign material (or non-foreign, like blood and lymph and pus) then you can apply visine with a qtip. some people like preparation h for this, but I wouldn't put butt cream near my eyes.