What is the occasion for the hadith "If you are afflicted, then conceal it" and what are its areas of application?

There is no hadith with this exact wording attributed to the Prophet, peace be upon him. However, Al-Ajlouni mentioned it in Kashf Al-Khafa' from Al-Sakhawi, with the wording: "Avoid these abominations which Allah has forbidden. So, whoever commits any of them, let him conceal himself with Allah's concealment and repent to Allah. For indeed, whoever exposes his misdeed, the Book of Allah will condemn him." The meaning intended is that whoever commits an indecency should conceal himself, repent, and not expose himself. This is supported by the hadith: "All of my Ummah are forgiven except those who commit sins openly."