I live in the campo and chop brush and sweat like a pig. I get all sorts of rashes. There are allergy-like rashes, fungus-like rashes, and insect bite itches. Although one can treat some rashes sometimes with corticosteroids, these medicines suppress immune reaction. So that rash might go away, but if there is any skin damage, it might get infected if the corticosteroid has been used more than a few days. Cortisone cream is widely available. Mometasone is a bit stronger and also available. I use it when the cortisone doesn't help within 12 hours.
There are various lotions related to caladryl. These are astringent (drying), and they reduce itching too. They are not corticsteroids so you can use them as needed. But they may not work on some rashes. Related to these are some medicines for skin parasite bugs. Such products may contain lindane (pesticide). I try to steer clear of topical pesticide application!
There is topical antifungal ointment. If the rash seems to form circular patches, it might be fungal. Then clotrimazole might help. In fact, steroids may even irritate fungal infections so if you applied steroid and the rash became worse, switch to the clotrimazole.
Sometimes if you really get into something itchy it is impractical to actually bathe in medicine. Well, they do offer some soaps that claim efficacy. But if I itch all over, I go for a couple of benadryl. They are anti-allergy pills. I don't know if they really stop the itch, but two caplets will put me sound asleep for about 8 hours, and usually by then the itching has passed.