I can confirm the exact cause of your symptoms only after I clinically examine you. The common possibilities of this rash are contact dermatitis, fungal infections and acnitic keratosis. Exposure to any allergen or contact with the clothing can lead to rashes. Fungal infection commonly has well defined borders and can present with itchiness and scales. A rare possibility is ingrown hair. The irritation of the hair follicle due to inward growing hair will cause chronic irritation and painful itchy bumps. Get the rash examined. A physical examination is important for correct diagnosis and treatment.
Take care and regards!
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