I cannot confirm anything without examination,but it can be due to hives,sweat dermatitis,allergies
,insect bite or dermatitis.
(medically known as urticaria) are red, itchy, raised areas of skin that appear in varying shapes and sizes.Many cases of hives are "idiopathic," meaning no cause is known. Others may be triggered by viral infections or medications.
Take non-sedating antihistamines such as Cetirizine(Zyrtec) or Loratadine(Claritin to get symptom relief.