https://www.allergybestbuys.co.uk/blogs/news/are-you-allergic-to-elastoplast
"Skin reactions to Elastoplast are of the allergic contact dermatitis type - a rash, hives, itching and/or a burning sensation, or intensely itchy little blisters that can weep.
If you react like this to sticking plasters you are probably sensitised to the rosin (or colophony) that is used in the adhesive. It's a natural substance obtained from conifers, created from pine balsam during the making of turpentine. When the turpentine is distilled away, colophony (rosin) is the hard yellow residue left behind."
It lists various products that can cause a reaction and a Micropore plaster is one of them.