How To Cure Swelling Of Forehead After Shaving The Head And Exposed To Sun?

My husband shaves his head and was out in the hot sun & got a severe sunburn. His forehead is swollen and he says when he moves his neck certain ways that it hurts his head...I am assuming because he has tightness of the skin on his burned head & forehead. He wonders if he should go the the ER but doens't want to because of the cost if it is not necessary. Should he be concerned enough to go to the E.R. or can he treat his symptoms at home?