Differential Diagnosis for Intertriginous Rash on Inner Thigh in a Male Adult
Single Most Likely Diagnosis
- Tinea cruris (Jock itch): This is a common fungal infection in the groin area, characterized by a red, itchy, and circular rash. The warm, moist environment of the inner thigh makes it an ideal location for fungal growth, making tinea cruris the most likely diagnosis.
Other Likely Diagnoses
- Intertrigo: A skin inflammation caused by friction and moisture, leading to redness, itching, and burning in the affected area. The inner thigh is a common site due to skin-to-skin contact.
- Eczema (Dermatitis): Atopic dermatitis or contact dermatitis can cause a rash in the inner thigh area, especially if the individual has allergies or sensitivities to certain substances.
- Psoriasis: Although less common in intertriginous areas, psoriasis can cause red, scaly patches on the inner thigh, especially in individuals with a history of the condition.
Do Not Miss Diagnoses
- Cellulitis: A bacterial skin infection that can cause redness, swelling, and warmth in the affected area. If left untreated, it can lead to serious complications, making it crucial not to miss this diagnosis.
- Erythrasma: A bacterial infection caused by Corynebacterium, which thrives in warm, moist environments. It can cause a reddish-brown rash and is often mistaken for other conditions, but it requires specific antibiotic treatment.
Rare Diagnoses
- Lichen planus: An autoimmune condition that can cause purplish, itchy, flat bumps on the skin, including the inner thigh area. It is less common but should be considered if other diagnoses are ruled out.
- Lichen sclerosus: A rare condition characterized by white, patchy skin that is thinner than normal. It can cause itching, pain, and bleeding, especially in the genital and anal areas, but can also occur on the inner thigh.