Dark red pimples on the scrotum are painless and itchy and may be related to poor local hygiene, environmental stimuli and allergies. 1. Normal physiological situation when the scrotum will not appear dark red acne. If you do not pay attention to personal hygiene, often wear chemical fiber material underwear will have an impact on the scrotum of local ventilation, in the scrotum of local warmth and humidity and sweat stimulation of the dual role of the scrotum can lead to dark red acne. 2. Long-term in the high humidity and high temperature environment or intake of too much spicy stimulating food, a lot of alcohol can lead to the scrotum local sweating, resulting in the scrotum part of the long-term in a moist environment, which is the cause of the scrotum with dark red acne and the main reason for the pain and itching. 3. Allergic people appear scrotum skin dark red acne can also be considered may be related to local allergies, such as the material of underwear, food allergies can lead to local dark red acne. If the diagnosis is clear, antihistamines such as loratadine can be given to relieve the discomfort. If you find that the scrotum has a dark red acne does not hurt, itchy, you should consult a doctor in time, under the guidance of the doctor to treat, do not delay, so as to avoid delaying the condition. Pay attention to rest on weekdays, quit smoking and drinking, and maintain a regular routine.