✅Answer: Please pay attention to the following narrations:

1 مُحَمَّدُ بْنُ عَلِيِّ الْحُسَيْنِ بِإِسْنَادِهِ عَنْ عَلِيِّ بْنِ جَعْفَرٍ أَنَّهُ سَأَلَ أَخَاهُ مُوسَى بْنَ جَعْفَرٍ عَنِ الرَّجُلِ يَكُونُ بِهِ الثَّالُولُ أَوِ الْجُرْحُ هَلْ يَصْلُحُ لَهُ أَنْ يَقْطَعَ الثَّالُولَ وَ هُوَ فِي صَلَاتِهِ أَوْ يَنْتِفَ بَعْضَ لَحْمِهِ مِنْ ذَلِكَ الْجُرْحِ وَ يَطْرَحَهُ قَالَ إِنْ لَمْ يَتَخَوَّفْ أَنْ يَسِيلَ الدَّمُ فَلَا بَأْسَ وَ إِنْ تَخَوَّفَ أَنْ يَسِيلَ الدَّمُ فَلَا يَفْعَلْهُ.

📚 Al-Faqih, Vol. 1, p. 254

Ali ibn Ja'far asked his brother Musa ibn Ja'far (peace be upon him): 'A person has a wound or a wart on their body; is it permissible for them to cut off the wart or peel off a part of the flesh of the wound and throw it away while they are in prayer?' The Imam said: 'If they do not fear that blood will flow, there is no problem, but if they are afraid that blood will flow from it, they should not do so.'

2 عَنْ سَعْدِ بْنِ عَبْدِ اللَّهِ عَنْ أَيُّوبَ بْنِ نُوحٍ عَنْ بَعْضِ أَصْحَابِنَا عَنْ أَبِي عَبْدِ اللَّهِ قَالَ: إِذَا قُطِعَ مِنَ الرَّجُلِ قِطْعَةٌ فَهِيَ مَيْتَةٌ فَإِذَا مَسَّهُ إِنْسَانٌ فَكُلُّ مَا كَانَ فِيهِ عَظْمٌ فَقَدْ وَجَبَ عَلَى مَنْ يَمَسُّهُ الْغُسْلُ فَإِنْ لَمْ يَكُنْ فِيهِ عَظْمٌ فَلَا غُسْلَ عَلَيْهِ.

📚 Al-Tahdhib, Vol. 1, p. 429

Imam Sadiq (peace be upon him) said: 'If a piece is separated from a human body, it is carrion (mayta), and if a person touches it, in any case where there is bone in it, ghusl (of touching the deceased) is obligatory for the person who has touched it, but if there is no bone in it, ghusl (of touching the deceased) is not on them.'

3 عَنْ عَلِيِّ بْنِ مُحَمَّدٍ عَنْ بَعْضِ أَصْحَابِنَا عَنْ جَعْفَرِ بْنِ إِبْرَاهِيمَ الْحَضْرَمِيِّ عَنْ سَعْدِ بْنِ سَعْدٍ قَالَ: سَأَلْتُ أَبَا الْحَسَنِ عَنِ الطِّينِ فَقَالَ أَكْلُ الطِّينِ حَرَامٌ مِثْلُ الْمَيْتَةِ وَ الدَّمِ وَ لَحْمِ الْخِنْزِيرِ....

📚 Al-Kafi, Vol. 6, p. 266

Sa'd said: 'I asked Imam Kadhim (peace be upon him) about eating mud.' The Imam said: 'Eating mud is forbidden just like eating carrion, blood, and pork....'

4 عَنْ مُحَمَّدِ بْنِ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ عَلِيِّ بْنِ أَبِي حَمْزَةَ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اللَّهِ أَنَّهُ قَالَ: فِي أَلَيَاتِ الضَّأْنِ تُقْطَعُ وَ هِيَ أَحْيَاءٌ إِنَّهَا مَيْتَةٌ.

📚 Al-Kafi, Vol. 6, p. 255

Imam Sadiq (peace be upon him) said about the fat tails of sheep that are cut off while the sheep are alive: 'Indeed, they are carrion.'

✅ What is clear from the above narrations and others is that if a part is separated from a human body or a sheep, and so on, it is carrion (mayta) and the rulings of carrion, including ritual impurity (najasa), apply to it, and there is no difference between a small and a large piece, even if it is skin from the body and no blood flows when it is peeled off. According to narration 2, the only important thing is that the piece is part of the body and is separated and cut off from the body, whether it is peeled from the human lip or other parts of the body.

✅ Of course, sometimes on the lips or other parts of the body, sediments resulting from dead skin cells and so on accumulate on top of each other and form a layer of skin. These cases are not considered part of and attached to the body, and peeling them off does not have the ruling of carrion. What is fundamental in this regard and should be considered the criterion is when a piece, no matter how small, of skin or flesh that is considered part of the body is separated.

✅ In multiple narrations, one of which was mentioned in number 3, eating carrion has been declared forbidden. Therefore, if the skin of the lip is part of the body and is separated, eating it is also forbidden.