I came to the Messenger of Allah ﷺ and asked his permission to slip my hand inside the opening of his shirt, and he was praying for me. Nothing prevented me from touching him as he prayed for me, and I found upon the upper part of his shoulder blade something like a lump.The narrator who related this to us is Muawiya bin Qurra, so this is part of the completion of Qurra's hadith, not the report of another companion.
حدثنا روح حدثنا قرة بن خالد قال سمعت
أتيت رسول الله ﷺ فاستأذنته أن أدخل يدي في جربانه وإنه ليدعو لي فما منعه أن ألمسه أن دعا لي قال فوجدت على نغض كتفه مثل السلعة حدثنا هو معاوية بن قرة فهو من تتمة حديث قرة لا أنه صحابي آخر
Its chain of transmission is sahih. Qurra bin Khalid Sadusi is a reliable and precise narrator, well known, and the hadith is like the one before it. The meaning of his saying, "the base of his shoulder," is the upper part of his shoulder, and his saying, "like a lump of flesh," means the gland between the skin and the flesh. It has been reported that its size was like that of a pigeon's egg.