Charak Samhita
यथासन्नं विकारस्य व्यधयेदाशु वा सिराम् । त्वङ्मांसस्नायुसङ्क्लेदो रक्तक्लेदाद्धि जायते ॥७०॥
or physician should perform siravyadha (blood letting through vein) promptly from the adjacent vein to the affected part, without which rakta kleda (putrifying blood content) gives rise to decomposed skin, flesh and ligaments.
english translation
yathAsannaM vikArasya vyadhayedAzu vA sirAm । tvaGmAMsasnAyusaGkledo raktakledAddhi jAyate ॥70॥
hk transliteration by Sanscript