My son is now 4 months old. He got a few hypopigmented patches when he was 20 days old and they are still on his body. He has one on stomach and few on chest, one scaly patch on leg and another at the back of the another leg and few on feet. These patches are not developing and infact they are getting disappeared now. Consulted two dermatologist so far. one mentioned dryness another birthmark. The picture was taken a month back. The patches has got better now. What this could possibly be? can some one help me get this diagnosed?