- Causes of Inner Thigh Rashes
- Contact Dermatitis
- Atopic Dermatitis or Eczema
- Excessive Heat and Sweat
- Insect Bites
- Activities Like Jogging and Cycling
- Diaper Dermatitis
- Fungal Infections
- Parasitic Infections
- Sexually Transmitted Diseases
- Manifestations of a Typical Rash on the Inner Thigh
- Home Remedies Used In Managing Inner Thigh Rashes
- Therapeutic Modalities for Inner Thigh Rashes
- Anti-Allergic Medications
- Moisturizing Products
- How to Prevent Inner Thigh Rashes
Rashes are skin lesions usually characterized as erythematous, slightly inflamed, and with either pruritus or burning sensation. These can be found in any part, any inch of the human body. One of the most common locations of rashes is the inner thigh.
Causes of Inner Thigh Rashes
A variety of factors can cause these rashes. These agents may be as simple as irritant, to as complex as an infection.
Rashes may occur whenever the skin comes in contact with an irritant. This goes for every part of the body, including the thighs.
Contact dermatitis is a condition characterized by inflammation of the skin brought about by undesirable reactions to an irritant substance. These include bathing products, lotions, moisturizers, laundry detergents, and even the clothing itself, when made of synthetic fabric or an irritant dye. [1, 2, 3]
On contact, certain plant toxins, like poison ivy and poison sumac, can also cause such rashes. These skin lesions are described as disturbing, with severe itching, and if neglected, can even lead to anaphylaxis. One can acquire such rash either by travelling, or by obtaining it from a pet. 
Image 1 : This is a patient with contact dermatitis, with rashes seen at the inner thigh.
Hypersensitivity reactions to either food or medications can also lead to rashes localized on the inner thigh. Most of these may accompany generalized rashes and itching. The usual suspects include peanuts, shellfish and seafood, chicken, and eggs. Most of them are mild and can easily be handled, however, at times, it can also produce life-threatening effects on other organs such as the kidneys, heart, intestines and joints, and unfortunately, be fatal. [1, 2]
Image 2 : An allergic rash at the inner thigh.
Atopic Dermatitis or Eczema
One of the most common causes of eczema is atopic dermatitis. It is a chronic skin condition resulting from hypersensitivity of the skin. This usually leads to erythema, dryness, pruritus and swelling of the skin. In far more serious cases, this can occur as blisters, with either hyper or hypopigmentation of the skin. Once scratched, the areas may turn red and leather-like in character. [2,4]
Image 3 : Eczematous rashes on the inner thigh.
Excessive Heat and Sweat
Extreme heat and sweat can block sweat glands and their ducts. These eventually lead to inflammation, blister formation, along with appearance of itchy rashes. They are usually in the areas of skin folds and friction, such that on the inner thighs.
Factors like humidity, clothing, physical activity, immature sweat ducts, and use of heavy creams and lotions can contribute to development of such rashes. 
Image 4 : A closer look at a heat rash on the inner thigh.
Bites, usually that of common insects such as ants, mosquitoes and bugs, can also produce inner thigh rashes. These usually resolve after a few hours. [2,3]
Image 5 : An erythematous rash was seen after an insect bite at the inner thigh.
Activities Like Jogging and Cycling
Due to humidity, heat, sweat and friction, activities such as jogging and cycling may also lead to inner thigh rashes. When caused by cycling, these are usually coined as saddle sores.
Either of these activities may lead to lesions characterized as chafed skin, which when neglected, may lead to intense blisters with pus formation known as folliculitis. For more severe cases, these may lead to large, swollen and painful abscesses. 
Image 6 : Cycling can also bring about inner thigh rashes, commonly called saddle sores.
Shaving of one’s thighs with the use of a razor may likely cause the occurrence of razor bumps, seen as erythematous, pruritic spots. These spots, if neglected, may extend and develop into a larger, redder, and more itchy rash. 
Image 7 : Shaving of the inner thighs can also lead to occurrence of rashes.
Occurring among newborns and infants, diaper use may also bring about rashes termed as diaper or nappy rashes. Presenting as skin irritation, these lesions are usually found when the diaper is filled with urine or feces, and not changed for a long period of time. These are usually described as erythematous rashes extending from the perianal region to the thighs, with either blister, boils, pus, or weeping discharges. [1, 5]
Image 8 : Prolonged exposure of the skin to a full and soiled diaper can lead to the development of diaper rashes extending to the inner thigh.
Otherwise known as jock itch, one of the most common fungal skin infections is usually caused by tinea cruris. Manifestations of which include severe pruritus of skin folds of the thigh, along with erythematous rashes that usually blister and produce pus. The rashes are usually presented as sharply bordered, red patches. 
Image 9 : Fungi can also cause skin irritation of the inner thigh.
A particular infection brought about by a parasite that would cause inner thigh rash is Schistosomiasis. When exposed to water contaminated with a Schistosoma parasite, a skin infection called Swimmer’s itch may ensue. During the illness, the parasite can burrow and penetrate the skin of the inner thigh, producing rashes.
Along with these rashes, systemic manifestations like abdominal pain and diarrhea can characterize this schistosomal infection. These particular infections are usually prevalent in tropical and subtropical regions of the world. 
Image 10 : Swimmer’s itch rashes located at the thigh.
Sexually Transmitted Diseases
Illnesses with sexual transmission, such as syphilis and herpes, can also bring about rashes on the inner thigh. They usually present in the genitals, and may extend to the inner region of the thighs. These may occur in both men and women. [2, 3]
Image 11 : Herpetic skin lesions found along the inner thigh.
This disease may present as tender, erythematous skin lesions, experienced alongside with a severe burning sensation. 
Image 12 : Skin lesions of patients infected with shingles: up-close.
Manifestations of a Typical Rash on the Inner Thigh
The following are the usual signs and symptoms present on a patient with inner thigh skin lesions: 
- Erythema on the affected area
- Blister formation
- Swelling and inflammation
- Skin irritation
- Pain and discomfort on ambulation
- Difficulty of breathing, if already on an anaphylactic state
Home Remedies Used In Managing Inner Thigh Rashes
Below are a number of substances and mixtures usually found at one’s home which can be utilized as treatment for rashes of the inner thigh: [1, 3]
- Olive oil can relieve skin tenderness and decrease its redness.
- Ice application every few hours, and even cold water washes, can soothe uncomfortable skin lesions.
- Ascorbic Acid supplements should be taken for better wound healing.
- Lotion with aloe vera can be applied topical to further alleviate skin irritation.
- Oatmeals can be used in bathing to relieve the inner thighs of their rashes.
- Chamomile tea wash may diminish skin irritability.
- Apple cider vinegar, mixed with honey and taken three times a day, may assist in controlling skin allergies.
- A concoction of cod liver and vitamin E cream may be applied on the rashes for a quicker cure.
- Herbs, such as neem and licorice, can help rid of toxins, reducing rashes.
Therapeutic Modalities for Inner Thigh Rashes
Medical management of rashes in this particular part of the body would include: 
Antihistamines can diminish skin eruptions and diminish redness and irritation.
These medications can decrease the inflammation and pruritic symptoms. These are mostly utilized for chronic eczematous rashes.
The skin should always be well hydrated. This can be achieved with the use of moisturizing creams, mainly composed of retinoids, which are derivatives of Vitamin A, and vitamin D. They do not only provide hydration, but also maintain the skin’s nourishment.
These drugs can help diminish the severity of rashes, and at the same time, help the integument retain its normal color.
As a skin therapy breakthrough, ultraviolet rays are found to be useful in decreasing the production of dermal cells. Thus, these assist in alleviating this skin nuisance.
How to Prevent Inner Thigh Rashes
This skin manifestation is a huge part of the itch-scratch-itch cycle. Thus, it would be wise if this cycle is prevented. The following are ways of doing so: 
- After bathing, completely pat dry the thigh and perineal areas.
- If one sees beginning manifestations of those rashes, he /she should wash the affected regions two times a day using cold water.
- Clothes, loose-fitting and made of cotton should be used. One must avoid frequent wearing of tight pants and undergarments.
- Talcum powder can be used cool the thigh areas and avoid further skin irritation.