is itching is there?? may be it can be urticaria....
Hello,
Such a rash which appears suddenly and burns can be due to contact dermatitis or hives due to an allergy. Wash the area with a mild cleanser with moisturizing properties like Cetaphil. Then apply a good hypoallergenic moisturizer over the area and wear cotton clothes. If the symptoms still persist then please get it evaluated from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
May possibly pityriasis alba/fungal infection. Right now apply vaseline and if diagnsis of fungus confirmed clotrimazole creme.Do consult your family doc.