Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You are 16, got red blotchs on chest, neck, stomach, since several months, mostly larger than a quarter, circular, they fade and come back.
They could be
eczema,
rosacea, or
acne, due to allergens and irritants. Treatment comprises treatment of the cause, and topical
steroids.
I advise you to
consult a dermatologist for diagnosis andtreatment.
Try to find out the allergens, like soap, dusting powder, clothes, etc and try to avoid,them.
Avoid taking fish, and other sea foods.
Wishing for a quick and complete recovery.
Best regards.