Common causes of rashes include:
Allergies, for example to food, dyes, medicines, insect stings, metals such as zinc or nickel; such rashes are often called hives.
Skin contact with an irritant
Bacterial or viral infection, e.g., by the viruses that cause chickenpox, smallpox, cold sores and measles
Fungal infection, such as ringworm
Reaction to vaccination
Skin diseases such as eczema or acne
Exposure to sun (sunburn) or heat
Friction due to chafing of the skin
Irritation such as caused by abrasives impregnated in clothing rubbing the skin. The cloth itself may be abrasive enough for some people
Autoimmune disorders such as psoriasis
Use this medication exactly as it was prescribed for you. Do not use the medication in larger amounts, or use it for longer than recommended by your doctor. Follow the instructions on your prescription label.
Call your doctor if your condition does not improve within 2 weeks, or if your symptoms get worse.
Heat and moisture can cause fungal infections in areas that are covered by clothing. Repeated use of antibiotics can also kill off all bacteria, good and bad, that help keep fungi at bay. The friction of clothing coupled with heat and moisture can make people of either gender have fungal infections in the area you describe, as well as the feet, and under the breasts or armpits.
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