You can and should practice mindfulness of feelings [sensations]
You should also develop perception of drawbacks;
And what is the perception of drawbacks? It’s when a mendicant has gone to a wilderness, or to the root of a tree, or to an empty hut, and reflects like this: ‘This body has much suffering and many drawbacks. For this body is beset with many kinds of affliction, such as the following. Diseases of the eye, inner ear, nose, tongue, body, head, outer ear, mouth, teeth, and lips. Cough, asthma, catarrh, inflammation, fever, stomach ache, fainting, dysentery, gastric pain, cholera, leprosy, boils, eczema, tuberculosis, epilepsy, herpes, itch, scabs, smallpox, scabies, hemorrhage, diabetes, piles, pimples, and ulcers. Afflictions stemming from disorders of bile, phlegm, wind, or their conjunction. Afflictions caused by change in weather, by not taking care of yourself, by overexertion, or as the result of past deeds. Cold, heat, hunger, thirst, defecation, and urination.’ And so they meditate observing drawbacks in this body. This is called the perception of drawbacks. https://suttacentral.net/an10.60/en/sujato
This condition has it's drawbacks but i think that it also has it's positives in that it can make one a bit more loathsome and serious.
I think in general one can replace loathsomeness by equanimity and endure the sensations. Afaik there is no trick or technique to it other than a comprehensive development of the faculties.
Also obv try to figure out what causes the itching and see if you can reduce it to a min.