Differential Diagnosis for 72 yo M with Rash in Axilla and Inguinal Area
- Single most likely diagnosis
- Intertrigo: A common condition in warm, moist areas of the body, such as the axilla and inguinal area, especially in older adults. It is caused by friction and moisture, leading to skin irritation and infection.
- Other Likely diagnoses
- Tinea cruris (Jock itch): A fungal infection that affects the skin in the groin area, causing a red, itchy rash. It is more common in warm weather and in individuals who sweat heavily.
- Eczema (Dermatitis): A condition that causes inflammation of the skin, leading to a red, itchy rash. It can occur in the axilla and inguinal area, especially in individuals with a history of allergies or skin conditions.
- Psoriasis: A chronic skin condition that causes red, scaly patches on the skin. It can occur in the axilla and inguinal area, although it is less common in these areas.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Malignancy (e.g., Squamous cell carcinoma, Basal cell carcinoma): Although rare, skin cancers can occur in the axilla and inguinal area. It is essential to consider this possibility, especially in older adults with a history of sun exposure or other risk factors.
- Infectious diseases (e.g., Cellulitis, Abscess): Bacterial or fungal infections can cause a rash in the axilla and inguinal area, and if left untreated, can lead to serious complications, such as sepsis or abscess formation.
- Rare diagnoses
- Lichen planus: A rare skin condition that causes an itchy, inflammatory rash. It can occur in the axilla and inguinal area, although it is more common in other areas of the body.
- Granuloma inguinale (Donovanosis): A rare bacterial infection that causes ulcerative lesions in the genital area, which can spread to the inguinal area. It is typically transmitted through sexual contact.