Thanks for your question.
Can you upload a photograph of the red spots ?
Thanks for uploading the photos.
It seems like urticaria which is actually the most common skin disorder seen in ER.
There can be several different triggers responsible for onset of urticaria and these can include allergy to foods, allergy to something coming in contact with skin, many different types of infections etc...
Initial treatment is in form of anti histamines like cetrizine and fexofenadine.
As you have had two episodes in a short duration it would be wise to have yourself seen by a doctor who can look for any underlying cause and treat accordingly.
In that case you may need stronger anti inflammatory drugs like steroids for control of urticaria.These are prescription only drugs.