Hi, welcome to the forum, your symptoms are suggestive of atopic or allergic dermatitis, secondary to exposure to allergen and mediated by IgE antibodies. Your body is known to hypersensitive to certain things.
Stinging insects, Aeroallergens (uncommon), Foods and additives like Milk, egg, peanuts, nuts, soy, and wheat are the most common agents to cause such dermatitis in children.
This triggering factor should be identified and should be avoided. Treatment includes anti histaminic and glucocorticoids against prescription.
Other causes needed to be ruled out are drug reaction, Stevens-Johnson syndrome etc. If drug allergy is suspected, need to discontinue the drug and report to your doctor immediately.
I suggest you to consult you to a skin specialist. Take care and regards.
You my see your Doctor nd try to discuss you problem with. That might be what is called Acen, but to be sure of what is it see the nearest Doctor as soon as possible so that he may take your blood to diagnos what is the problem