The possible reasons for the redness of the glans coronalis: 1. With glansitis can appear red in the coronalis, and accompanied by local pain, swelling and other symptoms. The actual fact is that you can find a lot of people who have been in the business for a long time, and they’ve been in the business for a long time. The phenomenon of redness in the coronal sulcus can gradually disappear if you wash regularly and keep the area clean.