Silk is allowed for men suffering from an itch
باب مَا يُرَخَّصُ لِلرِّجَالِ مِنَ الْحَرِيرِ لِلْحِكَّةِ
Sahih al-Bukhari, Book of Dress(view book)
Sahih al-Bukhari 5839
Narrated Anas:
The Prophet allowed Az-Zubair and 'Abdur-Rahman to wear silk because they were suffering from an itch
حَدَّثَنِي مُحَمَّدٌ، أَخْبَرَنَا وَكِيعٌ، أَخْبَرَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ رَخَّصَ النَّبِيُّ ﷺ لِلزُّبَيْرِ وَعَبْدِ الرَّحْمَنِ فِي لُبْسِ الْحَرِيرِ لِحِكَّةٍ بِهِمَا.
Classification
Sahih (Authentic)