My son is getting very small pink coloured pimple type spots on lower arms, lower leg, palms and feet last few days. They convert into blisters are itchy and filled with little fluid. He usually wakes up in night complaining about itching but at day time he is better. If we apply coconut oil he feels better. All activities, food habits, stool, urine is normal. No fever or any other symptoms.His Weight is 14 KGs and age is 3 yrs 2 months.