Make sure your problem is similar to what's visible here: http://oozingyellowcrusts.com/t/what-does-it-look-like-photos/20
I have experience with triamcinolone, which is a topical corticosteroids like hydrocortisone, but with a higher potency, which also means heavier side effects. In my case, triamcinolone removed the problem while using it, but also gave side effects such as skin thinning, red spider veins and possibly sensitive eyes to bright sunlight. Stopping with triamcinolone gave a heavy rebound effect, even though I tried to reduce the dose slowely. I would avoid a products such as triamcinolone at all costs. But hydrocortisone is weaker, but it maybe could also give a rebound effect.
Ask your derm for Soolantra. It's one of the very few products that helps a lot of members here, is pretty effective, easy to use, and has long lasting effects (differs from person to person).