My son is 6 months old. When he was about 3 to 4 months old he developed thick scaly dandruff on his soft spot on his head. After frequent oiling, shampooing and brushing the scales fell off one by one but every time a small amount of hair came out attached to it. He was free for about 2 months but now it's starting to develop again. kindly advise on it's cause and can it be prevented from recurring? I used spoo shampoo when he had the dandruff and now I use cetaphil shampoo. PS: the dandruff develops only on his soft spot.