What Causes Underboob Rashes and How to Treat Them

Underboob rashes are skin irritations that develop in the area beneath the breasts. These rashes are often caused by heat rash, sweat, friction, allergic reactions, and infections. Common symptoms include redness, itching, and discomfort. The treatment for underboob rashes usually involves keeping the area dry, using over-the-counter creams, and wearing comfortable clothing. If the problem persists, a healthcare provider may recommend specific treatments.

Causes of Underboob Rashes

What Causes Underboob Rashes and How to Treat Them

Sweating and Friction

Since the area under the breasts is prone to sweating, this moisture can create a perfect environment for rashes to develop. When sweat combines with friction from clothing or skin rubbing together, it can irritate the skin.

Allergic Reactions

Sometimes, your skin may react to certain fabrics, soaps, or lotions. If you wear a bra made of a material that irritates your skin, or if you use a product that doesn’t agree with your skin, you might notice a rash.


Yeast and fungal infections thrive in warm, moist places, so they may find the area under your breasts an ideal spot to grow. This can cause a red, itchy rash to form.

Heat Rash

Heat rash, or prickly heat, is a common cause of underboob rashes, especially in hot and humid weather. It occurs when sweat ducts become blocked and inflamed.


Mastitis is an inflammation of the breast tissue often related to breastfeeding, according to the American Academy of Family Physicians. Although it usually affects the entire breast, it can contribute to rashes and irritation in the underboob area.

Hormonal Changes

Changes in hormones, especially during menstruation, pregnancy, or menopause, can affect the skin’s sensitivity and lead to rashes under the breasts.

Other Skin Conditions

Certain skin conditions like eczema, contact dermatitis, cellulitis, pemphigus,, or psoriasis can also contribute to rashes under the breasts.

How Can You Treat Underboob Rashes?

Keep the Area Dry

One of the simplest ways to treat an underboob rash is to keep the area dry. After showering, make sure to dry the area under your breasts with a soft towel. You can even use a hair dryer in a cool setting to make sure the skin is totally dry.

Use Over-the-Counter Creams

You can find creams with ingredients like hydrocortisone at your local drugstore. These creams can help soothe the itchiness and redness.

Apply a Moisturizer

A hypoallergenic moisturizer can soothe the skin and help in healing the rash. Make sure it’s suitable for sensitive skin.

Apply Cold Compresses

A cold compress or an ice pack wrapped in a cloth can help reduce swelling and itching. Apply it to the affected area for about 15-20 minutes.

Wear Comfortable Clothing

Wearing clothes made of natural fibers like cotton helps your skin breathe. Avoid tight or synthetic fabrics that might irritate the skin. Avoid tight bras. That’s because bras that are too tight can cause friction and make the rash worse. Try wearing a comfortable and well-fitted bra.

Avoid Irritating Products

Stay away from products that may irritate your skin, such as harsh soaps or lotions with fragrances.

Use Talc-Free Powder

Powders that are talc-free can help keep the area dry and free from friction. Apply a little to the affected area.

Avoid Scratching

Scratching can make the rash worse. Try to resist the urge and use the treatments above instead.

Consult a Healthcare Provider

If the rash doesn’t improve with home care, you should consult a healthcare provider. They can diagnose the specific cause of the rash and prescribe appropriate treatments, such as prescription creams or medications.

Frequently Asked Questions

  1. Is it normal to have recurring underboob rashes?
    Recurring rashes might be a sign of an underlying issue. It’s best to talk to a healthcare provider to find the root cause.
  2. Is it normal to have underboob rashes during pregnancy? Yes, changes in the body during pregnancy can make underboob rashes more likely.
  3. How long does it take for an underboob rash to heal? With proper care, most rashes will heal within a week or two.
  4. Can underboob rashes spread to other parts of the body? Yes, if caused by a fungal infection, it can spread. Proper treatment can prevent this.
  5. What should I avoid if I have an underboob rash? You should avoid tight clothing, harsh soaps, and anything else that you know irritates your skin or causes an allergic reaction.

Further Reading: Armpit Rash: What It Is, Why You Get It, and How to Treat It

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