I have an itchy patch of skin just outside my
possible external fibrosed hemorrhoids
Hi and welcome to 'Ask A Doctor' service.
This may indicate fibrosed external hemorrhoid, fibroma or anal fissure.
If this is not painful then this is probably not a fissure.
I suggest to apply heparin ointment, and Preparation H, have 'Sitz' baths and have easier diet to soften your stool.
If there is be enlargement of lump, or it becomes painful, red or you get a fever then an abscess may be present and you should see a proctologist for a surgical procedure. Otherwise, you can try with those recommended measures.
Wish you good health.