I have skin desease. I dont know if its psoriasis...

Dear Customer
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? What is the treatment of Skin itching

You should conuslt a dermatologist in the nearest medical center for clinical assessment of your condition . You can benefit greatly from the following 

• Avoid exposure to offending Agents such as certain types of clothes and chemicals which cause skin irritation
• Avoid scratching your skin to prevent infection and aggrevation of your symptoms
• You can take a cold bath or apply cold compressors to relieve itching 
• Apply topical medication such as Betaderm twice daily relieve itching
• You should use Oral antihistamine like Loratadine before bedtime

? What are the cuases of Skin itching

• Eczema 
• Psoriasis
• Skin allergy
• Insects bites
• Bacterial infection
• Viral infection
• Nueropathy 
• Kidney and liver disease

? What should you do at the moment

You should follow the previous tips and instructions to relieve skin symptoms like itching . If your condition did not improve , you should consult a dermatologist for further assessment and to modify your treatment
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Kind Regards