Hi doctor good evening.! Me Phebe here .!! Since...

Treatment of skin alergy
You need to know the cause and avoid the irritants and causes of skin allergy , and  If there is itching and wide space of skin rash in this case you need to use dexamethasone injection and also you need to use topical hydrocortisone 1% and Prednizolone 5mg twice daily  , I also recommend to use antihistamine medications like Loratadine 10mg tab. to relief symptoms
Diagnosis
By taking full medical history and clinical examination , and doing CBC to exclude inflammation and doing skin allergy test
Causes

• Dermatological disease
• Side effects of drugs
• Systemic illness
• Local infection
• Sun exposure
• family history

Advice
you should go to the dermatologist to get proper managment

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