What kind of rash is red and whelped around waist under bra area?

Here are some possible causes of a red, whelped rash around the waist and under the bra area:

- Allergic contact dermatitis: This is a type of skin irritation that occurs when you come into contact with an allergen. In the case of a bra, this could be something like the detergent used to wash it, fabric dyes, or certain types of plastics.

- Irritant contact dermatitis: This is a type of skin irritation that occurs when you come into contact with a substance that is physically or chemically irritating to the skin. In the case of a bra, this could be caused by chafing from the fabric, or by the accumulation of sweat and dirt.

- Heat rash: This is a condition that occurs when the sweat glands become blocked and the sweat can't evaporate, leading to a red, itchy rash. Heat rash is more common in hot, humid weather, and can be aggravated by tight-fitting clothing, like a bra.

- Fungal infection: Fungal infections, like ringworm, can cause a red, scaly rash that can appear anywhere on the body, including the underbust area.

- Bacterial infection: Bacterial infections, such as cellulitis, can also cause a red, swollen, and tender rash. This type of rash can spread rapidly and may require antibiotics to treat.

It's important to note that self-diagnosis can be dangerous. If you have a red and whelped rash around your waist and under your bra area, it's best to see a healthcare provider for accurate diagnosis and treatment.