Sushruta Samhita
अथ चेत् स्थिरमूलत्वात् क्षारदग्धं न शीर्यते । इदमालेपनं तत्र समग्रमवचारयेत् ॥२०॥
If the alkali-burned area does not heal due to the stability of the roots, then a complete application of the paste should be performed there.
english translation
atha cet sthiramUlatvAt kSAradagdhaM na zIryate । idamAlepanaM tatra samagramavacArayet ॥20॥
hk transliteration by Sanscript