Hi doctor, My son, 5 year old, has developed these black(attached photo) spots since 2 days. Earlier also he had developed them few times in past 1 year but they were 2 or 3 in total,this time more. He didn't fall or had got none of physical injury or bruises recently. Could you please suggest what this could be? His vit d had come less 3 months back but iron was good and he took d rise since then weekly on doctor's input. One more thing is since 2 days he started riding bicycle(within our flat) so far was riding tricycle. Thanks in advance for any pointers.