I agree with Soundsgreat87. This would be amazing, if true, but we need some evidence to support the claim.
I've done some searching online, to learn more about Anusol. Their official web site shows that they offer two versions of the cream; Anusol and Anusol Plus. The regular cream has only one active ingredient; zinc sulfate monohydrate 0.5%. Zinc has many applications, but I think, in this case, it is probably used as an inflammatory, like zinc lozenges, for soar throat. The plus version also includes pramoxine hydrochloride 1%, which I understand is a sort of topical anesthetic. I have also come across a version called Anusol-HC, which supposedly includes hydrocortisone 2.5%, which is a steroid. This one is not shown on the official site, so I don't know if it is still available. I don't know which version was used by the OP. Maybe Itshard2bme can tell us which one he used.
I have never heard of Anusol before now, but like Wsmman, I've heard of models using hemorrhoid creams for under-eye puffiness. Mostly Preparation-H, which is supposed to cause some constriction of blood vessels. I wanted to compare their ingredients, and found there was a good bit of difference. Regular Preparation-H ointment actually includes Phenylephrine (the active ingredient in Sudafed-PE) as a vasoconstrictor. The maximum strength cream also includes Pramoxine HCl, just like Anusol Plus. Prep.-H Cooling Gel adds which hazel, as an astringent. And Prep.-H Anti-Itch cream has only one active ingredient, Hydrocortisone 1%, a steroid. So it's basically Cortaid.
We know that topical steroids can cause skin to thin out, and has been used to assist people with phimosis and frenulum breve, to stretch the effected area, and some studies have shown it to accelerate keratinization. I can see some of these hemorrhoid creams helping with discomfort and swelling for guys who are just starting out with retraction. But I'm not sure how any of the ingredients would help the skin to shrink. Unless there are some "inactive" ingredients in the cream, which may produce unexpected side effects.
I'd really like to know more about which specific cream was used by the OP and some theories on how it might produce the effects that he claims.