Hi,
If it has devloped suddenly within a day or may be a few hours it would be a sign of allergy,for treatment of allergy if it is been seen on a large part of body then you should straight go to a doctor,else you can take a levocetrizine 5mg once in night for 7 days.
Else i have told you that you should take one multivitamin tablet once daily for 4 weeks and you can use sunscreen lotion over face and any steroid cream over rest part of the body.
Also get an lft(blood test from any lab) for co ...
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