Hi doctor's My son is 4 year old. He got some kind of allergy in his back. I can see it only on dim light. I can see clearly when i squeeze his skin a little. It looks like a patches with his skin color ( which makes it difficult for others to see). It started spreading to his tummy and hip area. He has a lot of it. But no itchiness. Its been more than 3 weeks, still there. He is not in medication and don't have any illness or allergies, no fever or any other symptoms. We consult doctor and prescribed creams are not working. I am worried it may be symptoms of some other illness.