Astanga Hrudaya
चतुर्धा तत्तु तुच्छेन सह तुछस्य लक्षणम्। त्वग्विवर्णाष्यतेऽत्यर्थं न च स्फोटसमुद्भवः॥४७॥
Signs of insignificant/inadequate improper and excessively done agnikarma: The signs of inadequate burns are discoloration of the skin, severe burning sensation and absence of manifestation of boils/blisters. In case of improper burning, there is the appearance of blisters, burning sensation, and severe burning pain.
english translation