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Skin Rash on the Inner Thighs That Is Brown

author image Pamela Harrison
Pamela Harrison began writing in 2010. Her work has appeared in various online publications. Harrison's expertise is in health, fitness, parenting and relationships. She is currently writing her own novel, with hopes of having it published in the near future.
Skin Rash on the Inner Thighs That Is Brown
A rash on the inner thigh may have many different appearances and causes. Photo Credit Hemera Technologies/PhotoObjects.net/Getty Images

A rash can be defined as a skin irritation, and its appearance and duration can vary based on its cause. If the rash appears in conjunction with other symptom such as fever, vomiting, runny nose and cough, it may be attributed to a more serious condition or illness. A rash can also appear as a reaction to a bacteria or fungus within the body, or can be as a result of an allergy. There are a variety of reasons why a brown rash may appear on the inner thighs, and a variety of treatments for such rashes as well.


One cause of a brown skin rash on the inner thigh could be erythrasma, which is a bacterial infection commonly affecting skin folds. This can occur as a result of poor hygiene, overexposure to heat or humidity, obesity or as a result of diabetes. Treatment is usually found in the form of a topical cream such as benzoyl peroxide or some form of anti-fungal medication. An oral prescription may also be utilized, such as erythromycin. Treatment can last for a period of up to approximately three weeks.

Tinea Versicolor

A brown skin rash can also be the result of a fungal infection known as tinea versicolor. It will usually affect the shoulders and back, but can spread to other areas, including the groin. The infection causes the affected skin to change colors, and is caused by a type of yeast infection on the skin surface. Treatment includes the use of an anti-fungal topical cream such as miconazole, or your doctor may suggest the use of a selenium sulfide shampoo. Treatment time varies by the type of product used, but can last up to approximately four weeks.

Schamberg's Disease

It may be possible for a brown rash to appear on the thighs as a result of Schamberg's purpura. While the exact cause of this disorder is unknown, it affects mainly the lower half of the body, causing discoloration, possibly some slight bruising and may be accompanied by some pain. This condition is caused by the bleeding of tiny capillaries in the skin, and the brown stain occurs because of the iron deposits that are left over after the leaked blood is reabsorbed. In rare occasions, the area might itch. Itching can be controlled through the use of a cortisone cream.

Pityriasis Rosea

If the rash appears in a small circular pattern, with smaller patches following and spreading throughout the affected areas, it may be attributed to pityriasis rosea. While the severity and symptoms may vary from person to person, it commonly appears during the spring and fall months, generally affecting teens and young adults. The rash is not contagious, and there has been no determination as to its cause. Treatment can be found through the use of topical steroid creams and oral antibiotics such as erythromycin. Treatment time varies.


If a rash persists, or is accompanied by fever, cough or headache, visit your doctor or dermatologist. A professional can help to determine if the condition is because of a more serious illness and can prescribe the necessary medications to help treat the condition. This article is not intended to diagnose or help treat any type of skin irritation or disease.

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