Skin bruise like. Had on leg 3-4.

This is for my 5 yr old daughter. Last year she had some bruise blue mark on her shins. it comes and goes . and within a month it completely gone. this year also she had few of them. and also one on her forearm. she is very playful and active. we have noticed it is developing when she is very active. so this time we have done an online consultation with a paediatrician and asked to do blood test and s plasma test for morphology. everything went normal including esr CT bt etc. child has no other symptoms like fever pain tiredness etc. she started vitamin C tab 500. please give me valuable suggestions from a doctor like paediatrician. please excuse others who are not a doctor. I'll attach some of the pic which is 3 days before. currently most of the lesions are disappeared. two of then  are fading. only one pic is uploading which is on hand. it is fading. similar lesions had on leg 3-4.