Hello. Welcome to ask the doctor.
I understand your concern.
I have seen the attached pic also.
As per details, the most likely possibility for your symptoms is Allergic rash. It can be due to anything like recent infection, any food, seasonal change, drugs, pollen grains, new clothing, etc.
In such cases, I prefer to advise topical calamine lotion with oral antihistaminics like levocetrizine.
Avoid the offending agent if traced.
Visit your doctor so that he can examine you and give you prescription accordingly.
You can share my opinion with him.
I hope it helps.
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