Hi,Welcome to Health care magic forum.
What you describe are appears to be the utricaria, an
allergic reaction, due to some thing which you are using recently, and didn't suit you.
It may be the clothes, soap, powder, food, etc. Try to find out the thing you have used day before, and avoid it to stop recurrence.
If still continues consult a physician for treatment.
Take more of green leafy vegetables, pulses, sprouts, and
protein rich foods, to improve immunity.
Wishing for a quick and complete recovery.Thank you.