Burn scar; what should I do?

Hi I am an 18yr old girl. Boiling Water fell on me when I was 3. I have burn scar on my left chest and it is still tender And hurts sometimes. The normal skin has not come up and it is hard and pinkish white in colour. Sometimes I experience a sharp stinging pain for few seconds. And the growth of the left breast is slow it is quite small as compared to the right breast

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