Excessive Itchiness-- any tips?

I've noticed that my head is always super itchy whenever I have a protective style in-- especially a wig on. It doesn't matter how fresh the braids are or how much I oil my scalp-- the itchiness is almost unbearable. I'm not sure if it's because I have dandruff or a dry scalp. I'm thinking it may be the latter though, because I never struggle with flakes until a protective style has been in for at the absolute very least a week or two.

It's most noticable when I sweat though for sure, almost unbearable. Does anyone have any suggestions or tips? For reference I've relaxed my hair semi-annually for almost my entire life now. I have extremely thick 4c hair and I have oily skin, never struggled with eczema or anything of the sort.