The rash can be due to allergy or fungal infection.It would be better if you upload a pic.The allergy can be treated with antiallergic with steroid ointment. The fungal infection needs treatment with antifungal ointment and may be oral medication.
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Brief Answer:
It appears to be allergic dermatitis

Detailed Answer:
Hello XXXXXXX

Thanks for the query

I have seen the picture. It is quite large and appears to be allergic not fungal.Fungal skin infections usually smaller,discrete and has satellite lesion. I would like to rule out allergic dermatitis first.

I would advise you to get it clinically examined by a physician to confirm the diagnosis and apply some steroid ointment(mometasone/fluticasone/betamethasone) two to three times a day and take oral levocetrizine(for itching and also healing of lesion as it is an antihistaminic/antiallergic) twice a day under supervision of your physician.
Try to find out the allergen which has cause this. It may be food,medication,perfume, or contact with rubber/nickel etc.
If you have any doubt try to avoid that allergen.

I would be glad to answer if you have any further query
Regards

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Brief Answer:
It can be insect bite dermatitis

Detailed Answer:
Hello

Welcome again
It can be insect bite dermatitis,which is also a form of allergic dermatitis. Management remains almost same as in other allergic dermatitis.
Regards

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