How can I cure red spots under penis shaft

Treatment of red spots and pimples around the penis:
Due to the presence of several health problems that may cause itching and pimples in the private area, it's recommended to visit you GP for assessment of your condition. If there is any fungal infection, it will be treated by antifungal medications such as Miconazole cream twice a day and if it's bacterial infection, antibitoic such as Cefuroxime 500 mg will be prescribed. If it's due to allergy, antihistamine medicines such as Loratidine 10 mg once a day before bed can be used, in addition to using an ointment containing cortisone such as Betamethasone 1% twice a day for a week. Furthermore, it's recommended to take care of your private area and keep it clean and dry as much as you can, avoid scratch the area and wear cotton underwear.

Diagnosis:
Diagnosis can be made by having a clinical examination done by the specialist doctor. Some tests can be done, including a complete blood test (CBC) to detect infections represented by high white blood cells, and a skin allergy test can be done with the possibility of taking a biopsy from the area if needed.

What are the possible causes?

• Lack of personal hygiene.
• bacterial infections
• Allergy
• fungal infections
• Sexually transmitted diseases
• other reasons

Recommendation:
It's recommended to visit you GP for assessment and management.