my punis is sometime itching if medication name

Causes of penis rash  and itching ?
- std infection which can be caused by :
1. unprotected sexual intercourse 
2. touching infection partner 
3. anal sexual intercourse 
- bacterial infection ( non sexual transmitted ) 
- fungal infection ( non sexual transmitted ) 
- low personal hygine 
- allergy and autoimmmune disease such as eczema 
Treatment of penis rash and itching  ?
1. consult venrology doctor ( dermatologist and STD infection doctor ) to do the needed medical tests and determine the treatmnet pathways 
2. pay attention to your personal hygine 
3. drink plenty of water , and eat healthy food 
4. avoid unsafe and unprotected sexual intercourse
5. in case of std infection such as chlamydia , treatment would be :  Azithromycin or Doxycycline
6. in case of std infection such as gonorrhea , treatment would be : erthromycin or ceftrixone 
7. in case of fungal infection , treatment would be : fluconazole
8. in case of allergy and autoimmune disease , treatment would be : topical cortisone 
Needed medical examination :
1. physcial examination by doctor
2. blood test 
3. urine test 
4. urine culture test