Male lower redness and itching, which also refers to the redness and itching of the genitals, may be related to poor hygiene habits, or may be caused by allergic dermatitis, eczema and other reasons. 1. Poor hygiene habits: some men have poor personal hygiene habits, resulting in prolonged stimulation of the genitals by urine residue, or prolonged friction with dirtier underwear, which may cause redness and itching of the genitals. 2. Allergic dermatitis: common in allergic body, if the newly bought underwear is not cleaned to wear, it is likely to cause local allergies, induced allergic dermatitis, which may lead to genital redness and itching. 3. Eczema: common in more obese men, especially in the hot summer, because of the long time to keep sitting, resulting in more sweat in the genital area, long time in the hot and humid environment, easy to induce eczema, it will cause genital redness, itching. The redness and itchiness of the lower part of the male may also be caused by other reasons, it is recommended to consult a doctor as soon as possible, after clarifying the causative factors, to give targeted treatment.