
Recurring Skin Rash On Waist. Hydrocortisone Has Not Cured Rash. Should I Take Anti-fungal Pills Or A Cream?

I shall make an effort to provide you with good professional recommendations specific to your questions.
I understand that your waist region skin rash has got you concerned.
Firstly, I do not know if thats a allergic reaction to a detergent as you say. Because, if so you should have had a rash on all regions of your skin which has been exposed to the fabrics - which is not the case. Further, hyperpigmentation as you describe the rash to become darker is not the quality of an allergic reaction.
Secondly, if it is not allergy, then it needs to ascertained if it is related to Hay Fever that you already have. Certain skin conditions like eczema are known to co-exist with Hay Fever individuals. For this - skin allergic tests are needed, as much as IgE and blood tests proving this point. If so, eczema would need prescription medicines from askin specialist rather than just corticosteroids and over the counter medications. Moreover, I would not advise you to use the antifungal pills now. It needs proof that it is a fungal infection, which I do not think so. Only a clinical examination will decide the management medically.
For now, keep the area clean and dry, wear loose fitting clothing, avoid outdoors for while if you can, and consult the dermatologist as soon as possible.
Yet again, I duly appreciate your query to me, I do hope that you have found something useful to help you and I shall be glad to answer any further apprehensions.
Sincerely,

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