The main causes of redness are bacterial-fungal infections, which can lead to non-specific inflammation on the patient’s penis, and allergic factors that can also cause a state of redness and swelling of the penis. The main methods of treatment are home treatment and medication. Home treatment is mainly about keeping the private parts clean, changing underwear frequently and keeping the private parts dry so that bacteria can be prevented from multiplying, which will improve the patient’s condition, and most patients have their problems solved after making these changes. It also requires attention to allergies. The skin of the private parts is prone to allergies, such as allergies to some lubricants or allergies to some underwear fabrics can cause redness and swelling. Medication is mainly antibacterial drugs, the patient can apply some antibacterial cream on the skin of the private parts, so that it will work in the affected area, the effect is fast. Oral antibiotics can also be taken to inhibit bacteria. For allergic redness of the skin of the penis caused by some external stimuli, treatment with anti-allergy medication is generally required. During the treatment, avoid scratching the penis to avoid complications of infection. The allergen causing the allergy should be found in time and disengaged in time to avoid re-exposure. The main treatment for penile redness is to treat the inflammation, and the patient’s condition can be well improved by controlling the non-regeneration of bacteria, or the patient can seek the help of a doctor.