Answer: In the name of Allah, Most Compassionate, Most Merciful,
Assalam’aleykum, I pray this finds you in the best of states.
Jazakum Allah khayr for your question!
No, you don’t have to renew the washing of the skin places from which you have removed scabs. [ Ibn Abidin; Radd al-Muhtar]
This is because when an obligatory action has been performed in the past (in your case, the ritual bath), this duty is not incumbent on you anymore and thus cannot come back. [ Tahtawi; Hashiya on Maraqi al-Falah]
And Allah knows best.
May Allah Most High grant you the best of this world and the next. Please keep us in your du’as!
[Ustadh] Sufyan Qufi