Hi, i used to get cold sores on my lips.. but now...

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Treatment of penis itchy rash:

It depends on the cause, so treatment may include:

• Anti fungal treatment as miconazole cream twice daily
• Anti allergic creams as betamethazone twice daily
• Anti viral creams as cyclovir twice daily

Causes of penis itchy rash:

It may be due to:

• Fungal infection associated with white discoloration, itching and rash
• Allergy associated with itching, rash, swelling, redness
• Viral infeciton associated with pain, rash
• Scabies associated with night itching and body rash...etc

Diagnosis of the cause of penis itchy rash:

It depends on the clinical examination by an orthopedist and investigation as:

• CBC
• Rash biopsy

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It is may be due to contact transmitted from lips to genitalias . It is also you have to exclude BEHCET DISEASE

You should do these test 
cpr 
ELISA 
viral load 
Pap smear