I have small 3months baby have skin problem, and...

Dear Customer
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What is the first step to treat your baby medical condition ?
1. consult pediatric / dermatology doctor soon 
2. do the needed tests such as :
- physical examination
- skin culture ( if needed ) 
What is the possible treatment options :
1. zinc ointment 
2. anti-histamine topical creams 
General advices :
1. avoid any irritation material to your baby skin
2. use cotton cloths 
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Kind Regards