Coronary inguinal redness and swelling may be physiological phenomenon, but also may be localized infection factors, allergies and other reasons. 1. Physiological phenomenon: in the state of sexual excitement, penile erection may appear coronary groove redness and swelling, masturbation, sexual life and other stimuli can also cause coronary groove redness and swelling. 2. Local infectious factors: for example, bacterial, fungal, trichomonas and other pathogenic bacteria infection, caused by inflammation of the foreskin and glans, inflammatory stimulation can also lead to coronal inguinal redness and swelling. 3. Allergy: contact dermatitis, drug rash, urticaria and other allergic reactions in the coronary groove area can also lead to coronary groove redness and swelling. Coronary groove redness and swelling, need to go to the hospital in time to check, if it is a physiological phenomenon does not need treatment, if it is caused by disease, follow the doctor’s instructions for treatment.